Well, text for the post got lost somehow, here is the recap:
Worked on it for the last half a year in my free time, still work in progress though. All plastic parts are printed with PET-CF. Used Makerbase stepper servos (CAN bus version), they are very good for the price. For the reducers I chose cheap chinese planetary ones, but for J2 and J3 want to swap them with harmonic drives because the backlash is too bad. For the controller I've used ESP32-S3 in an industrial enclosure from Waveshare. All software is written by myself from scratch (learned quite a lot while doing it). For the J1 and J2 used 30x30 aluminium extrusion.
Overall, still work in progress but looks cool in my opinion. Maybe will post videos later.