Not only does Keychron make awesome keyboards, but their firmware is also open source (latest is based on Zephyr RTOS), and now they have open sourced their hardware design files too!
https://github.com/Keychron/Keychron-Keyboards-Hardware-Design

GitHub - Keychron/Keychron-Keyboards-Hardware-Design: Industrial design files for Keychron keyboards and mice. 100+ models with CAD assets in STEP, DXF, DWG, and PDF. Source-available, with commercial use allowed for original compatible accessories within the license terms.
Industrial design files for Keychron keyboards and mice. 100+ models with CAD assets in STEP, DXF, DWG, and PDF. Source-available, with commercial use allowed for original compatible accessories wi...
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