Have as much as possible open source? Also the tools used to build the keyboard
- KiCAD (schematic, layout) (http://kicad.org/ )
- avr-gcc (https://gcc.gnu.org/wiki/avr-gcc )
- Export data for alu body from a layer in the KiCAD layout data
Own layout and schematic but based on this project to keep compatibility with tmk firmware and qmk firmware:
https://github.com/tmk/HHKB_controller/blob/master/schematic/HHKB_controller_revG.pdf
- LM1117 3.3V LDO http://cdn-reichelt.de/documents/datenblatt/A200/LM1117-TI.pdf
- NCP1402 step up DCDC Converter https://www.onsemi.com/pub/Collateral/NCP1402-D.PDF ->farnell: out of production - Alternative MAX1724 https://www.mouser.de/datasheet/2/256/MAX1722-MAX1724-97057.pdf but no Kicad Lib yet
- MCP 73831/2 Single Cell Lipo Charge Management Controller http://ww1.microchip.com/downloads/en/DeviceDoc/20001984g.pdf
- RN42 Bluetooth Module http://ww1.microchip.com/downloads/en/DeviceDoc/50002328A.pdf
- ATMEGA32U4 8 bit Microcontroller with USB http://ww1.microchip.com/downloads/en/devicedoc/atmel-7766-8-bit-avr-atmega16u4-32u4_datasheet.pdf
- AT90USB1286 8 bit Microcontroller with USB but more IO than ATMEGA32U4 http://ww1.microchip.com/downloads/en/DeviceDoc/doc7593.pdf
Sandwich case or alu bend case
http://www.keyboard-layout-editor.com/#/
Prototype for Switches without big PCB and description how to build a small keyboard: https://learn.sparkfun.com/tutorials/cherry-mx-switch-breakout-hookup-guide
Fullsize Keyboard matrix example with atmega32u4: https://easyeda.com/farmakon/GH80_3000-4f3cee521afd4be3858c4b5cc3b76f9e
- beta layout https://de.beta-layout.com/leiterplatten/
- LiteOn https://www.leiton.de/index.html
- jlcpcb https://jlcpcb.com/
Maybe using a front panel service for the keyboard front, aluminum or acrylic would be possible at beta layout