I've created some GitHub repos for the 3d model and pcb:

https://github.com/dejanristic78/Tardygrade-BOM

https://github.com/dejanristic78/Tardygrade-pcb

https://github.com/dejanristic78/Tardygrade-3d-model

https://github.com/dejanristic78/Tardygrade_stl_files

Firmware repo is on my to-do list.

I will include the appropriate open source license when the project nears completion. For now, anyone can download and experiment with these files for personal use.

Please beware that the robot is still being developed and is not yet production ready. If you would like to build it yourself, and perhaps provide me with feedback while doing so, you are welcome to join the Tardygrade Discord server. PM me for details.