Thanks for the followers and likes! :)

After some more testing of version 2, everything looks good, so we uploaded our schematics and PCB design files (in KiCAD 5). It still is not the final version, but it works as intended and we found no hardware problems (yet) - so if there are some bugs, they are not critical.
And here is a 3D render of the PCB:

Firmware is still far from being ready, but we'll share it too when it would work smooth enough.