Almost finished.
I was thinking of printing motor brackets, but decided to make them, using Al "L" profile - process is quicker and result is much stronger (not that is really important.. but since the motors are mounted such that they could collide, perhaps metal bracket is the way to go).
Electronics is also ready (OnStep), I just need to mount it in enclosure.
Finished, ready for action.
ONstep controller (classic MEGA, with Steve's daughter board) is stand-alone (with keypad), or it can be controlled by mob app (via BT) or from laptop (via BT or USB), as convenient.