replace front panel geometry with cetz diagram

2 files changed, 247 insertions, 651 deletions

diff --git a/mechanical-specifications.typ b/mechanical-specifications.typ
index 11fe05c..eb00fca 100644
--- a/mechanical-specifications.typ
+++ b/mechanical-specifications.typ
@@ -950,10 +950,254 @@ interlocking U-shaped steel channel:
 ===== Front panel <front-panel>
 
 #figure(
-  image("pictures/front-panel-geometry.svg"),
-  caption: [Front channel construction],
-) <figure-front-channel-construction>
+  cetz.canvas({
+    import cetz.draw: *
+
+    // Scale factor: 1 mm = 0.050 drawing units
+    let s = 0.050
+
+    let h-total = 177.8 * s // 8.890 mm
+    let h-body = 165.1 * s // 8.255 mm
+    let h-lip = 6.35 * s // 0.3175 mm (6.35 mm top/bottom lips)
+    let w = 38.0 * s // 1.900 mm (panel width)
+    let f = 8.0 * s // 0.400 mm (8 mm L-channel flange overlap)
+
+    let y-bot = 0
+    let y-lip-bot = h-lip
+    let y-lip-top = h-total - h-lip
+    let y-top = h-total
+
+    // Helper: Draw M3 clearance hole (3.2 mm diameter)
+    let draw-m3-hole(cx, cy) = {
+      circle((cx, cy), radius: 1.6 * s, fill: white, stroke: 0.8pt + black)
+      line((cx - 2.5 * s, cy), (cx + 2.5 * s, cy), stroke: 0.3pt + luma(120))
+      line((cx, cy - 2.5 * s), (cx, cy + 2.5 * s), stroke: 0.3pt + luma(120))
+    }
+
+    // Helper: Draw M3 countersunk hole (concentric circles + crosshair)
+    let draw-csink(cx, cy) = {
+      circle((cx, cy), radius: 3.0 * s, fill: white, stroke: 0.8pt + black)
+      circle((cx, cy), radius: 1.6 * s, fill: luma(200), stroke: 0.5pt + black)
+      line((cx - 4.0 * s, cy), (cx + 4.0 * s, cy), stroke: 0.3pt + luma(120))
+      line((cx, cy - 4.0 * s), (cx, cy + 4.0 * s), stroke: 0.3pt + luma(120))
+    }
+
+    // ==========================================
+    // 1. FRONT ELEVATION (38.0 x 177.8 mm)
+    // ==========================================
+    let x-front-start = 0
+    let x-front-end = x-front-start + w
+    let x-front-mid = (x-front-start + x-front-end) / 2
+
+    // View Title
+    content((x-front-mid, y-top + 0.8), text(
+      size: 8.5pt,
+      weight: "bold",
+    )[FRONT ELEVATION])
+
+    // Main Panel Outer Boundary
+    rect(
+      (x-front-start, y-bot),
+      (x-front-end, y-top),
+      fill: luma(245),
+      stroke: 1.2pt + black,
+    )
+
+    // Lip Limit Boundary Indicators (Dashed horizontal lines at 6.35 mm from top/bottom)
+    line(
+      (x-front-start, y-lip-bot),
+      (x-front-end, y-lip-bot),
+      stroke: (paint: luma(110), thickness: 0.7pt, dash: "dashed"),
+    )
+    line(
+      (x-front-start, y-lip-top),
+      (x-front-end, y-lip-top),
+      stroke: (paint: luma(110), thickness: 0.7pt, dash: "dashed"),
+    )
+
+    // Centered M3 Panel Mounting Holes in Top and Bottom Lips
+    draw-m3-hole(x-front-mid, h-lip / 2)
+    draw-m3-hole(x-front-mid, h-total - h-lip / 2)
+
+    // L-Channel Attachment Countersunk Holes (X = 4.0 mm, Y = 30.0 mm and 135.0 mm from body start)
+    let y-hole-lower = y-lip-bot + 30.0 * s
+    let y-hole-upper = y-lip-bot + 135.0 * s
+    let x-hole-lchannel = x-front-start + 4.0 * s
+
+    draw-csink(x-hole-lchannel, y-hole-lower)
+    draw-csink(x-hole-lchannel, y-hole-upper)
+
+    // Dimension: Panel Width (38.0 mm)
+    line(
+      (x-front-start, y-bot),
+      (x-front-start, y-bot - 0.6),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-front-end, y-bot),
+      (x-front-end, y-bot - 0.6),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-front-start, y-bot - 0.55),
+      (x-front-end, y-bot - 0.55),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.10,
+      stroke: 0.6pt + black,
+    )
+    content((x-front-mid, y-bot - 0.85), text(size: 7pt)[$qty(38.0, "mm")$])
+
+    // Dimension: Total Height (177.8 mm / 4U)
+    line(
+      (x-front-start, y-bot),
+      (x-front-start - 0.6, y-bot),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-front-start, y-top),
+      (x-front-start - 0.6, y-top),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-front-start - 0.55, y-bot),
+      (x-front-start - 0.55, y-top),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.10,
+      stroke: 0.6pt + black,
+    )
+    content(
+      (x-front-start - 0.85, (y-bot + y-top) / 2),
+      text(size: 7pt)[$qty(177.8, "mm")$ ($qty(4, "U")$)],
+      angle: 90deg,
+    )
+
+    // Dimension: Lip Height (6.35 mm)
+    line(
+      (x-front-end, y-top),
+      (x-front-end + 0.6, y-top),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-front-end, y-lip-top),
+      (x-front-end + 0.6, y-lip-top),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-front-end + 0.55, y-lip-top),
+      (x-front-end + 0.55, y-top),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.08,
+      stroke: 0.6pt + black,
+    )
+    content(
+      (x-front-end + 1.2, (y-lip-top + y-top) / 2),
+      text(size: 6.5pt)[$qty(6.35, "mm")$],
+    )
+
+    // Dimension: Body Height (165.1 mm)
+    line(
+      (x-front-end, y-lip-bot),
+      (x-front-end + 0.6, y-lip-bot),
+      stroke: 0.4pt + luma(140),
+    )
+    line(
+      (x-front-end + 0.55, y-lip-bot),
+      (x-front-end + 0.55, y-lip-top),
+      mark: (start: "stealth", end: "stealth"),
+      mark-size: 0.10,
+      stroke: 0.6pt + black,
+    )
+    content(
+      (x-front-end + 0.85, (y-lip-bot + y-lip-top) / 2),
+      text(size: 7pt)[$qty(165.1, "mm")$],
+      angle: -90deg,
+    )
 
+    // ==========================================
+    // 2. REAR ELEVATION (INNER FACE: 38.0 x 177.8 mm)
+    // ==========================================
+    let x-rear-start = 4.5
+    let x-rear-end = x-rear-start + w
+    let x-rear-mid = (x-rear-start + x-rear-end) / 2
+
+    // View Title
+    content((x-rear-mid, y-top + 0.8), text(
+      size: 8.5pt,
+      weight: "bold",
+    )[REAR ELEVATION (INNER FACE)])
+
+    // Painted Central Surface Area
+    rect(
+      (x-rear-start, y-bot),
+      (x-rear-end, y-top),
+      fill: luma(225),
+      stroke: 1.2pt + black,
+    )
+
+    // Masked Unpainted Area 1: Top Lip (6.35 mm full width)
+    rect(
+      (x-rear-start, y-lip-top),
+      (x-rear-end, y-top),
+      fill: luma(250),
+      stroke: (paint: luma(120), thickness: 0.6pt, dash: "dashed"),
+    )
+
+    // Masked Unpainted Area 2: Bottom Lip (6.35 mm full width)
+    rect(
+      (x-rear-start, y-bot),
+      (x-rear-end, y-lip-bot),
+      fill: luma(250),
+      stroke: (paint: luma(120), thickness: 0.6pt, dash: "dashed"),
+    )
+
+    // Masked Unpainted Area 3: L-Channel Front Flange Contact Strip (8 mm along right side in rear view)
+    rect(
+      (x-rear-end - f, y-lip-bot),
+      (x-rear-end, y-lip-top),
+      fill: luma(250),
+      stroke: (paint: luma(120), thickness: 0.6pt, dash: "dashed"),
+    )
+
+    // Center Painted Label
+    content(
+      (x-rear-start + (w - f) / 2, (y-lip-bot + y-lip-top) / 2),
+      text(size: 7.5pt, fill: luma(100))[Painted Surface],
+    )
+
+    // M3 Lip Holes in Rear View
+    draw-m3-hole(x-rear-mid, h-lip / 2)
+    draw-m3-hole(x-rear-mid, h-total - h-lip / 2)
+
+    // L-Channel Attachment Holes in Rear View (X = 38.0 - 4.0 = 34.0 mm in rear view)
+    let x-hole-rear = x-rear-end - 4.0 * s
+    draw-m3-hole(x-hole-rear, y-hole-lower)
+    draw-m3-hole(x-hole-rear, y-hole-upper)
+
+    // Masked Contact Area Callout Annotations
+    line(
+      (x-rear-mid, y-top - h-lip / 2),
+      (x-rear-end + 0.5, y-top + 0.3),
+      stroke: 0.5pt + black,
+    )
+    content(
+      (x-rear-end + 0.55, y-top + 0.3),
+      text(size: 6.5pt)[Masked unpainted lip (chassis grounding)],
+      anchor: "south-west",
+    )
+
+    line(
+      (x-rear-end - f / 2, y-hole-upper + 10.0 * s),
+      (x-rear-end + 0.5, y-hole-upper + 10.0 * s),
+      stroke: 0.5pt + black,
+    )
+    content(
+      (x-rear-end + 0.55, y-hole-upper + 10.0 * s),
+      text(size: 6.5pt)[Masked 8 mm flange contact strip],
+      anchor: "west",
+    )
+  }),
+  caption: [Cassette Front Panel technical drawings showing Front Elevation (with countersunk L-channel attachment holes and lip mounting holes) and Rear Elevation (inner face detailing masked unpainted EMI contact areas).],
+) <figure-cassette-front-panel-diagram>
 / Geometry: $qty(177.8, "mm") times qty(38.0, "mm")$, body section
   $qty(165.1, "mm")$
 / Holes: Features Countersunk Through-Holes corresponding to the L-Channel's
diff --git a/pictures/front-panel-geometry.svg b/pictures/front-panel-geometry.svg
deleted file mode 100644
index 39aa860..0000000
--- a/pictures/front-panel-geometry.svg
+++ /dev/null
@@ -1,648 +0,0 @@
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-<svg
-   viewBox="0 0 582.5354 709.44208"
-   width="582.5354"
-   height="709.44208"
-   style="font-family:serif"
-   version="1.1"
-   id="svg53"
-   sodipodi:docname="front-panel-geometry.svg"
-   inkscape:version="1.4.4 (dcaf3e7d9e, 2026-05-05)"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   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#">
-  <sodipodi:namedview
-     id="namedview53"
-     pagecolor="#ffffff"
-     bordercolor="#000000"
-     borderopacity="0.25"
-     inkscape:showpageshadow="false"
-     inkscape:pageopacity="0.0"
-     inkscape:pagecheckerboard="0"
-     inkscape:deskcolor="#d1d1d1"
-     showborder="false"
-     borderlayer="false"
-     inkscape:zoom="1.2698413"
-     inkscape:cx="346.89375"
-     inkscape:cy="519.75"
-     inkscape:window-width="1920"
-     inkscape:window-height="1011"
-     inkscape:window-x="0"
-     inkscape:window-y="0"
-     inkscape:window-maximized="1"
-     inkscape:current-layer="svg53" />
-  <defs
-     id="defs3">
-    <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>
-    <pattern
-       inkscape:collect="always"
-       xlink:href="#maskHatch"
-       id="pattern53"
-       patternTransform="rotate(45,-608.74415,-371.59198)" />
-    <!-- Standard CAD Arrowheads -->
-    <!-- Diagonal Hatch Pattern for Inner Unpainted/Masked Contact Areas -->
-    <pattern
-       id="maskHatch"
-       width="6"
-       height="6"
-       patternTransform="rotate(45 0 0)"
-       patternUnits="userSpaceOnUse">
-      <line
-         x1="0"
-         y1="0"
-         x2="0"
-         y2="6"
-         stroke="#000000"
-         stroke-width="0.8"
-         stroke-dasharray="2,2"
-         id="line2" />
-    </pattern>
-    <!-- Countersunk Hole Symbol (Front Facing) -->
-  </defs>
-  <!-- ================================================================= -->
-  <!-- TITLE & HEADER                                                    -->
-  <!-- ================================================================= -->
-  <!-- ================================================================= -->
-  <!-- VIEW 1: ISOMETRIC VIEW (LEFT SIDE)                                -->
-  <!-- ================================================================= -->
-  <text
-     x="212.94775"
-     y="9.6103516"
-     text-anchor="middle"
-     fill="#000000"
-     font-size="13px"
-     font-weight="700"
-     id="text5">ISOMETRIC VIEW</text>
-  <text
-     x="212.94775"
-     y="25.610352"
-     text-anchor="middle"
-     fill="#666666"
-     font-size="10px"
-     id="text6"
-     style="fill:#000000;fill-opacity:1">(Showing Front/Rear Faces, Lips &amp; Masking)</text>
-  <polygon
-     points="150,120 190,110 190,395 150,405 "
-     fill="#f8fafc"
-     stroke="#000000"
-     stroke-width="2"
-     id="polygon6"
-     transform="translate(12.947754,-72.389648)"
-     style="fill:#ffffff;fill-opacity:1" />
-  <polygon
-     points="190,110 198,108 198,393 190,395 "
-     fill="#e2e8f0"
-     stroke="#000000"
-     stroke-width="1.5"
-     id="polygon7"
-     transform="translate(12.947754,-72.389648)" />
-  <line
-     x1="162.94775"
-     y1="57.610352"
-     x2="202.94775"
-     y2="47.610352"
-     stroke="#000000"
-     stroke-width="1"
-     stroke-dasharray="3, 3"
-     id="line7" />
-  <line
-     x1="162.94775"
-     y1="322.61035"
-     x2="202.94775"
-     y2="312.61035"
-     stroke="#000000"
-     stroke-width="1"
-     stroke-dasharray="3, 3"
-     id="line8" />
-  <polygon
-     points="198,108 198,393 204,391 204,106 "
-     fill="url(#maskHatch)"
-     stroke="#000000"
-     stroke-width="0.8"
-     id="polygon8"
-     transform="translate(12.947754,-72.389648)" />
-  <line
-     x1="182.94775"
-     y1="52.610352"
-     x2="112.94775"
-     y2="27.610352"
-     stroke="#000000"
-     stroke-width="1"
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-     style="stroke-width:0;stroke-dasharray:none" />
-  <text
-     x="107.94775"
-     y="23.610352"
-     text-anchor="end"
-     fill="#000000"
-     font-size="10px"
-     font-weight="700"
-     id="text9">Top Lip Extension</text>
-  <text
-     x="107.94775"
-     y="35.610352"
-     text-anchor="end"
-     fill="#555555"
-     font-size="9px"
-     id="text10"
-     style="fill:#000000;fill-opacity:1">6.35 mm (0.25&quot;)</text>
-  <line
-     x1="182.94775"
-     y1="187.61035"
-     x2="92.947754"
-     y2="187.61035"
-     stroke="#000000"
-     stroke-width="1"
-     id="line12"
-     style="stroke-width:0.717;stroke-dasharray:none" />
-  <text
-     x="87.947754"
-     y="185.61035"
-     text-anchor="end"
-     fill="#000000"
-     font-size="10px"
-     font-weight="700"
-     id="text13">Body Section</text>
-  <text
-     x="87.947754"
-     y="197.61035"
-     text-anchor="end"
-     fill="#555555"
-     font-size="9px"
-     id="text14"
-     style="fill:#000000;fill-opacity:1">Height: 165.1 mm (6.5&quot;)</text>
-  <line
-     x1="213.94775"
-     y1="177.61035"
-     x2="272.94775"
-     y2="177.61035"
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-     stroke-width="1"
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-     style="stroke-width:0.717;stroke-dasharray:none" />
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-     x="277.94775"
-     y="175.61035"
-     fill="#000000"
-     font-size="10px"
-     font-weight="700"
-     id="text15">Inner Face Contact Area</text>
-  <text
-     x="277.94775"
-     y="187.61035"
-     fill="#555555"
-     font-size="9px"
-     id="text16"
-     style="fill:#000000;fill-opacity:1">Masked (Unpainted) for grounding</text>
-  <!-- ================================================================= -->
-  <!-- VIEW 2: FRONT ELEVATION (OUTSIDE FACE)                            -->
-  <!-- ================================================================= -->
-  <text
-     x="466.94775"
-     y="9.6103516"
-     text-anchor="middle"
-     fill="#000000"
-     font-size="13px"
-     font-weight="700"
-     id="text17">FRONT ELEVATION</text>
-  <text
-     x="466.94775"
-     y="25.610352"
-     text-anchor="middle"
-     fill="#666666"
-     font-size="10px"
-     id="text18"
-     style="fill:#000000;fill-opacity:1">(Outside Face: 177.8 mm × 38.0 mm)</text>
-  <rect
-     x="438.44775"
-     y="47.610352"
-     width="57"
-     height="266.70001"
-     fill="#f8fafc"
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-     style="stroke-width:0.717;stroke-dasharray:none" />
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-     x1="442.65396"
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-     marker-start="url(#arrow-start)"
-     marker-end="url(#arrow-end)"
-     id="line23"
-     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
-  <text
-     x="466.94775"
-     y="362.61035"
-     text-anchor="middle"
-     fill="#000000"
-     font-size="10.5px"
-     font-weight="700"
-     id="text23">Width: 38.0 mm</text>
-  <text
-     x="466.94775"
-     y="374.61035"
-     text-anchor="middle"
-     fill="#555555"
-     font-size="8.5px"
-     id="text24"
-     style="fill:#000000;fill-opacity:1">+0.0 / -0.1 mm</text>
-  <line
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-     y1="57.135345"
-     x2="526.94775"
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-     marker-start="url(#arrow-start)"
-     marker-end="url(#arrow-end)"
-     id="line26"
-     style="marker-start:url(#Triangle);marker-end:url(#Triangle)" />
-  <g
-     transform="rotate(90,178.9937,359.95405)"
-     id="g26">
-    <text
-       x="0"
-       y="0"
-       text-anchor="middle"
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-  <line
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-  <line
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-       id="text29">Panel Height: 177.8 mm ±0.1 (4U)</text>
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-  <!-- VIEW 3: REAR ELEVATION (INSIDE FACE & MASKING)                    -->
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-  <text
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-  <text
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-  <text
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-     style="fill:#000000;fill-opacity:1">(Thickness &amp; Lip Extensions)</text>
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-  <line
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-  <line
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-  <line
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-     id="text43">6.35 mm Lip</text>
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-  <line
-     x1="469.94775"
-     y1="708.31036"
-     x2="511.94775"
-     y2="708.31036"
-     stroke="#000000"
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-     id="line45"
-     style="stroke-width:0.717;stroke-dasharray:none" />
-  <line
-     x1="512.94775"
-     y1="701.15662"
-     x2="512.94775"
-     y2="706.72656"
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-  <text
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-     id="text46">6.35 mm Lip</text>
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-  <text
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-     id="text47">1.2 mm</text>
-  <text
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-     text-anchor="end"
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-     font-size="8.5px"
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-  <!-- ================================================================= -->
-  <!-- TECHNICAL NOTES SUMMARY BOX                                       -->
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