add mechanical data page

_index.md

@@ -51,5 +51,5 @@ We moved from our [Hamburg GitLab](https://gitlab.hamburg.ccc.de/card10/) to:
 - [Firmware](http://git.card10.badge.events.ccc.de/card10/firmware)
 - [LogBook](/en/logbook)
 - [Interhacktions](/en/interhacktions)
-- [Fundamental board](/en/fundamental-board-overview)
-- [usb-c](/en/usbc)
+- [Hardware Overview](/en/hardware-overview)
+- [USB-C](/en/usbc)

en/mechanical.md

+---
+title: Mechanical Data
+---
+
+Our reconstruction of the card10 badge is made of two 1 mm PCBs, spaced 5 mm apart.
+
+- The [Fundamental Board](/en/hardware-overview/#fundamental-board) is a bit larger than the [Harmonic Board](/en/hardware-overview/#harmonic-board)
+ - To make sewing the wristband connections easier when the card10 is fully assembled
+- The wirstband is about 34-38 mm wide and 25 - 30 cm long
+- The two PCBs are spaced using three 5 mm brass spacers and one 5 mm nylon spacer
+- The PCBs are screwed to the spacers using eight 3 mm M2 screws
+
+## Dimensions
+### Fundamental Board
+![Fundamental Board dimensions](/media/hardware/Fundamental-Board-dimensions.png)
+### Harmonic Board
+![Harmonic Board dimensions](/media/hardware/Harmonic-Board-dimensions.png)
+
+## Design Files
+### Fundamental Board
+
+SVG with bottom copper layer. View is from above (through the PCB)
+![Fundamental Board dimensions](/media/hardware/Fundamental-Board-dimensions.svg)
+
+
+### Harmonic Board
+![Harmonic Board dimensions](/media/hardware/Harmonic-Board-dimensions.svg)