From 0c50dbe8568d1d2e74caaddd6e2d1484c1d4f544 Mon Sep 17 00:00:00 2001
From: Denis Chevalier <perso@denischevalier.fr>
Date: Mon, 10 Aug 2026 16:32:42 +0200
Subject: replace cassette external dimensions svg with cetz drawing

---
 mechanical-specifications.typ             | 221 ++++++++++-
 pictures/cassette-external-dimensions.svg | 628 ------------------------------
 2 files changed, 218 insertions(+), 631 deletions(-)
 delete mode 100644 pictures/cassette-external-dimensions.svg

diff --git a/mechanical-specifications.typ b/mechanical-specifications.typ
index e39a05e..3be195d 100644
--- a/mechanical-specifications.typ
+++ b/mechanical-specifications.typ
@@ -1,4 +1,5 @@
 #import "lib/unify.typ": qty, qtyrange
+#import "@preview/cetz:0.5.2"
 
 = Mechanical specifications <mechanical-specifications>
 
@@ -36,9 +37,223 @@ especially in terms of magnetic shielding.
 ==== External dimensions <cassette-external-dimensions>
 
 #figure(
-  image("pictures/cassette-external-dimensions.svg"),
-  caption: "Cassette external dimensions",
-) <figure-cassette-external-dimensions>
+  cetz.canvas({
+    import cetz.draw: *
+
+    // Scale factor: 1 mm = 0.035 drawing units
+    let s = 0.035
+
+    let h-panel = 177.8 * s // 6.223
+    let h-body = 165.1 * s // 5.7785
+    let h-lip = 6.35 * s // 0.22225
+    let w-panel = 38.0 * s // 1.33
+    let d-body = 152.4 * s // 5.334
+    let t-panel = 3.0 * s // 0.105 (exaggerated slightly for visual clarity)
+
+    let y-center = 0
+    let y-top-panel = h-panel / 2
+    let y-bot-panel = -h-panel / 2
+    let y-top-body = h-body / 2
+    let y-bot-body = -h-body / 2
+
+    // --- FRONT ELEVATION ---
+    let x-front-left = 0
+    let x-front-right = w-panel
+    let x-front-mid = w-panel / 2
+
+    // View Title
+    content((x-front-mid, y-top-panel + 0.8), text(
+      size: 9pt,
+      weight: "bold",
+    )[FRONT ELEVATION])
+
+    // Front Panel Outline
+    rect(
+      (x-front-left, y-bot-panel),
+      (x-front-right, y-top-panel),
+      fill: luma(250),
+      stroke: 1.2pt + black,
+    )
+
+    // Hidden Body Transition Lines (Dashed)
+    line(
+      (x-front-left, y-top-body),
+      (x-front-right, y-top-body),
+      stroke: (paint: luma(130), thickness: 0.7pt, dash: "dashed"),
+    )
+    line(
+      (x-front-left, y-bot-body),
+      (x-front-right, y-bot-body),
+      stroke: (paint: luma(130), thickness: 0.7pt, dash: "dashed"),
+    )
+
+    // Panel Mounting Screw Holes (Top and Bottom Lips)
+    circle(
+      (x-front-mid, y-top-panel - h-lip / 2),
+      radius: 0.08,
+      fill: white,
+      stroke: 0.8pt + black,
+    )
+    circle(
+      (x-front-mid, y-bot-panel + h-lip / 2),
+      radius: 0.08,
+      fill: white,
+      stroke: 0.8pt + black,
+    )
+
+    // Dimension: Panel Width (38.0 mm)
+    line(
+      (x-front-left, y-bot-panel),
+      (x-front-left, y-bot-panel - 0.6),
+      stroke: 0.5pt + luma(120),
+    )
+    line(
+      (x-front-right, y-bot-panel),
+      (x-front-right, y-bot-panel - 0.6),
+      stroke: 0.5pt + luma(120),
+    )
+    line(
+      (x-front-left, y-bot-panel - 0.6),
+      (x-front-right, y-bot-panel - 0.6),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.12,
+      stroke: 0.7pt + black,
+    )
+    content((x-front-mid, y-bot-panel - 0.9), text(
+      size: 7.5pt,
+    )[$qty(38.0, "mm")$])
+
+    // Dimension: Panel Height (177.8 mm / 4U)
+    line(
+      (x-front-left, y-top-panel),
+      (x-front-left - 0.6, y-top-panel),
+      stroke: 0.5pt + luma(120),
+    )
+    line(
+      (x-front-left, y-bot-panel),
+      (x-front-left - 0.6, y-bot-panel),
+      stroke: 0.5pt + luma(120),
+    )
+    line(
+      (x-front-left - 0.6, y-bot-panel),
+      (x-front-left - 0.6, y-top-panel),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.12,
+      stroke: 0.7pt + black,
+    )
+    content(
+      (x-front-left - 0.95, y-center),
+      text(size: 7.5pt)[$qty(177.8, "mm")$ ($qty(4, "U")$)],
+      angle: 90deg,
+    )
+
+    // --- SIDE ELEVATION ---
+    let x-side-start = 2.8
+    let x-panel-back = x-side-start + t-panel
+    let x-body-rear = x-panel-back + d-body
+    let x-side-mid = (x-side-start + x-body-rear) / 2
+
+    // View Title
+    content((x-side-mid, y-top-panel + 0.8), text(
+      size: 9pt,
+      weight: "bold",
+    )[SIDE ELEVATION])
+
+    // Cassette Steel Body
+    rect(
+      (x-panel-back, y-bot-body),
+      (x-body-rear, y-top-body),
+      fill: luma(235),
+      stroke: 1.2pt + black,
+    )
+
+    // Front Panel Plate Attached to Body
+    rect(
+      (x-side-start, y-bot-panel),
+      (x-panel-back, y-top-panel),
+      fill: luma(210),
+      stroke: 1.2pt + black,
+    )
+
+    // Rear DB-25 Connector Standoff / Bezel Projection
+    rect(
+      (x-body-rear, y-center - 0.6),
+      (x-body-rear + 0.25, y-center + 0.6),
+      fill: luma(240),
+      stroke: 0.8pt + black,
+    )
+
+    // Dimension: Depth (152.4 mm)
+    line(
+      (x-panel-back, y-top-panel),
+      (x-panel-back, y-top-panel + 0.2),
+      stroke: 0.5pt + luma(120),
+    )
+    line(
+      (x-body-rear, y-top-panel - 0.2),
+      (x-body-rear, y-top-panel + 0.2),
+      stroke: 0.5pt + luma(120),
+    )
+    line(
+      (x-panel-back, y-top-panel + 0.2),
+      (x-body-rear, y-top-panel + 0.2),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.12,
+      stroke: 0.7pt + black,
+    )
+    content(((x-panel-back + x-body-rear) / 2, y-top-panel + 0.4), text(
+      size: 7.5pt,
+    )[$qty(152.4, "mm")$])
+
+    // Dimension: Body Height (165.1 mm)
+    line(
+      (x-body-rear, y-top-body),
+      (x-body-rear + 0.6, y-top-body),
+      stroke: 0.5pt + luma(120),
+    )
+    line(
+      (x-body-rear, y-bot-body),
+      (x-body-rear + 0.6, y-bot-body),
+      stroke: 0.5pt + luma(120),
+    )
+    line(
+      (x-body-rear + 0.6, y-bot-body),
+      (x-body-rear + 0.6, y-top-body),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.12,
+      stroke: 0.7pt + black,
+    )
+    content(
+      (x-body-rear + 0.9, y-center),
+      text(size: 7.5pt)[$qty(165.1, "mm")$],
+      angle: -90deg,
+    )
+
+    // Dimension: Top Lip Height (6.35 mm)
+    line(
+      (x-panel-back, y-top-panel),
+      (x-body-rear + 1.8, y-top-panel),
+      stroke: 0.4pt + luma(160),
+    )
+    line(
+      (x-panel-back, y-top-body),
+      (x-body-rear + 1.8, y-top-body),
+      stroke: 0.4pt + luma(160),
+    )
+    line(
+      (x-body-rear + 1.65, y-top-body),
+      (x-body-rear + 1.65, y-top-panel),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.10,
+      stroke: 0.7pt + black,
+    )
+    content(
+      (x-body-rear + 2.2, (y-top-panel + y-top-body) / 2),
+      text(size: 7.0pt)[$qty(6.35, "mm")$],
+    )
+  }),
+  caption: [Cassette enclosure orthographic projections (front and side elevation) detailing external physical dimensions and lip offsets.],
+) <figure-cassette-external-dimensions-diagram>
 
 #figure(
   table(
diff --git a/pictures/cassette-external-dimensions.svg b/pictures/cassette-external-dimensions.svg
deleted file mode 100644
index 793ec3f..0000000
--- a/pictures/cassette-external-dimensions.svg
+++ /dev/null
@@ -1,628 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   viewBox="0 0 649.76904 478.91016"
-   width="649.76904"
-   height="478.91016"
-   style="font-family:serif;"
-   version="1.1"
-   id="svg26"
-   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   xmlns:xlink="http://www.w3.org/1999/xlink"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
-   xmlns:cc="http://creativecommons.org/ns#">
-  <defs
-     id="defs2">
-    <pattern
-       inkscape:collect="always"
-       xlink:href="#Strips1_3"
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-       patternTransform="matrix(1.4142133,1.4142133,-1.4142133,1.4142133,0,0)"
-       x="0"
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-    <pattern
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-       id="Strips1_3"
-       style="fill:#c0c0c0"
-       inkscape:stockid="Stripes 04 (1:3)"
-       inkscape:isstock="true"
-       inkscape:label="Stripes 04 (1:3)">
-      <rect
-   style="stroke:none"
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-   y="-0.5"
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-
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-    <marker
-       style="overflow:visible"
-       id="marker34"
-       refX="0"
-       refY="0"
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-       inkscape:isstock="true"
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-      <path
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-         d="M 5.77,0 -2.88,5 V -5 Z"
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-    <marker
-       style="overflow:visible"
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-       refX="0"
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-    <marker
-       style="overflow:visible"
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-       refX="0"
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-    <marker
-       style="overflow:visible"
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-       refX="0"
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-    </marker>
-    <marker
-       style="overflow:visible"
-       id="marker28"
-       refX="0"
-       refY="0"
-       orient="auto-start-reverse"
-       inkscape:stockid="Triangle arrow"
-       markerWidth="1"
-       markerHeight="1"
-       viewBox="0 0 1 1"
-       inkscape:isstock="true"
-       inkscape:collect="always"
-       preserveAspectRatio="xMidYMid">
-      <path
-         transform="scale(0.5)"
-         style="fill:context-stroke;fill-rule:evenodd;stroke:context-stroke;stroke-width:1pt"
-         d="M 5.77,0 -2.88,5 V -5 Z"
-         id="path28" />
-    </marker>
-    <marker
-       style="overflow:visible"
-       id="marker27"
-       refX="0"
-       refY="0"
-       orient="auto-start-reverse"
-       inkscape:stockid="Triangle arrow"
-       markerWidth="1"
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-         id="path27" />
-    </marker>
-    <marker
-       style="overflow:visible"
-       id="marker26"
-       refX="0"
-       refY="0"
-       orient="auto-start-reverse"
-       inkscape:stockid="Triangle arrow"
-       markerWidth="1"
-       markerHeight="1"
-       viewBox="0 0 1 1"
-       inkscape:isstock="true"
-       inkscape:collect="always"
-       preserveAspectRatio="xMidYMid">
-      <path
-         transform="scale(0.5)"
-         style="fill:context-stroke;fill-rule:evenodd;stroke:context-stroke;stroke-width:1pt"
-         d="M 5.77,0 -2.88,5 V -5 Z"
-         id="path26" />
-    </marker>
-    <marker
-       style="overflow:visible"
-       id="Triangle"
-       refX="0"
-       refY="0"
-       orient="auto-start-reverse"
-       inkscape:stockid="Triangle arrow"
-       markerWidth="1"
-       markerHeight="1"
-       viewBox="0 0 1 1"
-       inkscape:isstock="true"
-       inkscape:collect="always"
-       preserveAspectRatio="xMidYMid">
-      <path
-         transform="scale(0.5)"
-         style="fill:context-stroke;fill-rule:evenodd;stroke:context-stroke;stroke-width:1pt"
-         d="M 5.77,0 -2.88,5 V -5 Z"
-         id="path135" />
-    </marker>
-    <!-- Standard CAD Arrowheads -->
-    <!-- Subtle Hatch Pattern for Metal Section Cut/Fill -->
-    <marker
-       style="overflow:visible"
-       id="Triangle-7"
-       refX="0"
-       refY="0"
-       orient="auto-start-reverse"
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-      <path
-         transform="scale(0.5)"
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-         d="M 5.77,0 -2.88,5 V -5 Z"
-         id="path135-5" />
-    </marker>
-    <marker
-       style="overflow:visible"
-       id="marker28-3"
-       refX="0"
-       refY="0"
-       orient="auto-start-reverse"
-       inkscape:stockid="Triangle arrow"
-       markerWidth="1"
-       markerHeight="1"
-       viewBox="0 0 1 1"
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-       preserveAspectRatio="xMidYMid">
-      <path
-         transform="scale(0.5)"
-         style="fill:context-stroke;fill-rule:evenodd;stroke:context-stroke;stroke-width:1pt"
-         d="M 5.77,0 -2.88,5 V -5 Z"
-         id="path28-5" />
-    </marker>
-  </defs>
-  <!-- Title & Header -->
-  <!-- ================================================================= -->
-  <!-- SIDE ELEVATION (LEFT VIEW)                                       -->
-  <!-- ================================================================= -->
-  <g
-     id="side-elevation"
-     transform="translate(-103.00342,-71.128906)">
-    <!-- View Label -->
-    <text
-       x="380"
-       y="80"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="12px"
-       font-weight="700"
-       id="text4">SIDE ELEVATION</text>
-    <!-- Cassette Body Outline -->
-    <!-- Scale: Y-span 177.8mm = 391.16px (2.2 px/mm). Top Panel Y = 100, Bottom Panel Y = 491.16 -->
-    <!-- Body Top Y = 113.97 (+6.35mm lip), Body Bottom Y = 477.19 (-6.35mm lip) -->
-    <!-- Depth 152.4mm = 335.28px. Front X = 210, Rear X = 545.28 -->
-    <!-- Body Box -->
-    <rect
-       x="210"
-       y="113.97"
-       width="335.28"
-       height="363.22"
-       fill="url(#diagonalHatch)"
-       stroke="#000000"
-       stroke-width="2"
-       id="rect4"
-       style="fill:url(#pattern38)" />
-    <!-- Front Panel (with lips extending top & bottom) -->
-    <!-- Panel Thickness ~ 3mm = 6.6px -> X: 203.4 to 210 -->
-    <rect
-       x="203.39999"
-       y="100"
-       width="6.5999999"
-       height="391.16"
-       fill="#f8fafc"
-       stroke="#000000"
-       stroke-width="2"
-       id="rect5" />
-    <!-- Chassis Rail Reference Indicators (Dashed) -->
-    <line
-       x1="160"
-       y1="113.97"
-       x2="545.57501"
-       y2="113.97"
-       stroke="#888888"
-       stroke-width="0.987998"
-       stroke-dasharray="4, 4"
-       id="line5"
-       style="stroke:#000000;stroke-width:0.717;stroke-dasharray:none;stroke-opacity:1" />
-    <line
-       x1="160.45"
-       y1="477.49402"
-       x2="544.57501"
-       y2="477.49402"
-       stroke="#888888"
-       stroke-width="0.986139"
-       stroke-dasharray="4, 4"
-       id="line5-6"
-       style="font-family:ui-sans-serif, system-ui, '-apple-system', BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;stroke:#000000;stroke-width:0.717;stroke-dasharray:none;stroke-opacity:1" />
-    <text
-       x="555"
-       y="109"
-       fill="#666666"
-       font-size="9px"
-       font-style="italic"
-       id="text6"
-       style="fill:#000000;fill-opacity:1">Chassis Rail Limit</text>
-    <text
-       x="555"
-       y="487"
-       fill="#666666"
-       font-size="9px"
-       font-style="italic"
-       id="text7"
-       style="fill:#000000;fill-opacity:1">Chassis Rail Limit</text>
-    <!-- DIMENSIONS FOR SIDE VIEW -->
-    <!-- 1. Panel Height (177.8 mm) -->
-    <line
-       x1="205.39999"
-       y1="100"
-       x2="119.975"
-       y2="100"
-       stroke="#000000"
-       stroke-width="0.717266"
-       id="line7" />
-    <line
-       x1="203.39999"
-       y1="491.16"
-       x2="120.15"
-       y2="491.16"
-       stroke="#000000"
-       stroke-width="0.708076"
-       id="line8" />
-    <line
-       x1="120"
-       y1="104.26476"
-       x2="120"
-       y2="487.62024"
-       stroke="#000000"
-       stroke-width="1.18797"
-       marker-start="url(#arrow-start)"
-       marker-end="url(#arrow-end)"
-       id="line9"
-       style="marker-start:url(#marker29);marker-end:url(#marker30)" />
-    <g
-       transform="rotate(-90,203.79,91.79)"
-       id="g9">
-      <text
-         x="0"
-         y="0"
-         text-anchor="middle"
-         fill="#000000"
-         font-size="11px"
-         font-weight="700"
-         id="text9">Panel Height: 177.8 mm ±0.1 (4U / 7.0&quot;)</text>
-    </g>
-    <!-- 2. Body Height (165.1 mm) -->
-    <line
-       x1="160"
-       y1="118.23675"
-       x2="160"
-       y2="474.37323"
-       stroke="#000000"
-       stroke-width="1.18824"
-       marker-start="url(#arrow-start)"
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-       id="line10"
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-         y="0"
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-         fill="#000000"
-         font-size="11px"
-         font-weight="600"
-         id="text10">Body Height: 165.1 mm ±0.1 (6.5&quot;)</text>
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-    <!-- 3. Top Lip Height (6.35 mm) -->
-    <line
-       x1="216"
-       y1="101.53458"
-       x2="216"
-       y2="110.39766"
-       stroke="#000000"
-       stroke-width="0.796515"
-       marker-start="url(#arrow-start)"
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-       id="line13"
-       style="marker-start:url(#Triangle);marker-end:url(#marker28)" />
-    <text
-       x="302"
-       y="108"
-       text-anchor="end"
-       fill="#000000"
-       font-size="9px"
-       font-weight="600"
-       id="text13">Lip height: 6.35 mm</text>
-    <line
-       x1="216.45143"
-       y1="479.82849"
-       x2="216.45143"
-       y2="488.69156"
-       stroke="#000000"
-       stroke-width="0.796515"
-       marker-start="url(#arrow-start)"
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-       id="line13-2"
-       style="font-family:ui-sans-serif, system-ui, '-apple-system', BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;marker-start:url(#Triangle-7);marker-end:url(#marker28-3)" />
-    <text
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-       y="486.29391"
-       text-anchor="end"
-       fill="#000000"
-       font-size="9px"
-       font-weight="600"
-       id="text13-9"
-       style="font-family:ui-sans-serif, system-ui, '-apple-system', BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif">Lip height: 6.35 mm</text>
-    <!-- Bottom Lip Pointer -->
-    <!-- 4. Depth (152.4 mm) -->
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-       y1="491.16"
-       x2="203.39999"
-       y2="519.125"
-       stroke="#000000"
-       stroke-width="0.636398"
-       id="line14"
-       style="stroke-width:0.717;stroke-dasharray:none" />
-    <line
-       x1="545.28003"
-       y1="477.19"
-       x2="545.28003"
-       y2="520.57501"
-       stroke="#000000"
-       stroke-width="0.679787"
-       id="line15"
-       style="stroke-width:0.717;stroke-dasharray:none" />
-    <line
-       x1="207.64386"
-       y1="520"
-       x2="541.03613"
-       y2="520"
-       stroke="#000000"
-       stroke-width="1.18501"
-       marker-start="url(#arrow-start)"
-       marker-end="url(#arrow-end)"
-       id="line16"
-       style="marker-start:url(#marker31);marker-end:url(#marker32)" />
-    <text
-       x="374.34"
-       y="536"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="11px"
-       font-weight="700"
-       id="text16">Depth: 152.4 mm ±0.2 (6.0&quot;)</text>
-  </g>
-  <!-- ================================================================= -->
-  <!-- FRONT ELEVATION (RIGHT VIEW)                                      -->
-  <!-- ================================================================= -->
-  <g
-     id="front-elevation"
-     transform="translate(-103.00342,-27.128906)">
-    <!-- View Label -->
-    <text
-       x="700"
-       y="36"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="12px"
-       font-weight="700"
-       id="text17">FRONT ELEVATION</text>
-    <!-- Center Line -->
-    <!-- Front Panel Box -->
-    <!-- Width 38.0mm = 83.6px -> Center 700, Left = 658.2, Right = 741.8 -->
-    <rect
-       x="658.20001"
-       y="56"
-       width="83.599998"
-       height="391.16"
-       fill="#f8fafc"
-       stroke="#000000"
-       stroke-width="2"
-       id="rect17"
-       style="fill:#ffffff;fill-opacity:1" />
-    <!-- Inner Body Fold Line / Lip Line (Dashed) -->
-    <line
-       x1="658.20001"
-       y1="69.970001"
-       x2="741.79999"
-       y2="69.970001"
-       stroke="#000000"
-       stroke-width="1"
-       stroke-dasharray="3, 3"
-       id="line18" />
-    <line
-       x1="658.20001"
-       y1="433.19"
-       x2="741.79999"
-       y2="433.19"
-       stroke="#000000"
-       stroke-width="1"
-       stroke-dasharray="3, 3"
-       id="line19" />
-    <!-- Banana Jack Columns (0.75" / 19.05mm grid reference indication) -->
-    <!-- Left Column: 700 - 20.95 = 679.05, Right Column: 700 + 20.95 = 720.95 -->
-    <!-- DIMENSIONS FOR FRONT VIEW -->
-    <!-- 1. Panel Width (38.0 mm) -->
-    <line
-       x1="658.20001"
-       y1="447.16"
-       x2="658.20001"
-       y2="475.84998"
-       stroke="#000000"
-       stroke-width="0.644595"
-       id="line22"
-       style="stroke-width:0.717;stroke-dasharray:none" />
-    <line
-       x1="741.79999"
-       y1="447.16"
-       x2="741.79999"
-       y2="475.84998"
-       stroke="#000000"
-       stroke-width="0.644595"
-       id="line23"
-       style="stroke-width:0.717;stroke-dasharray:none" />
-    <line
-       x1="662.14313"
-       y1="476"
-       x2="737.85687"
-       y2="476"
-       stroke="#000000"
-       stroke-width="1.142"
-       marker-start="url(#arrow-start)"
-       marker-end="url(#arrow-end)"
-       id="line24"
-       style="marker-start:url(#marker33);marker-end:url(#marker34)" />
-    <text
-       x="700"
-       y="492"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="11px"
-       font-weight="700"
-       id="text24">Width: 38.0 mm</text>
-    <text
-       x="700"
-       y="505"
-       text-anchor="middle"
-       fill="#000000"
-       font-size="9.5px"
-       id="text25">+0.0 / -0.1 mm (1.5&quot;)</text>
-    <!-- 2. Grid Pitch Reference (38.1 mm theoretical center-to-center) -->
-    <!-- Neighbor center-line at 700 + 83.82px = 783.82 -->
-  </g>
-  <!-- ================================================================= -->
-  <!-- TECHNICAL NOTES / SPECIFICATION BOX                              -->
-  <!-- ================================================================= -->
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-     id="metadata38">
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-- 
cgit