I have read now what problems you had with the grounding and EMF. Are you not afraid to install the homing sensors in your system?
Please do not wire the limit switches as I did! Better wire them in series to a relay coil and from the relay to BoB estop and the stepper drives enable pin if they have it.

If I were in your place I would try to convert all the control circuit to 24V if possible. 24V is the industry standard as it is more reliable and resistant to noise and EMF than lower voltages.

How far is your workshop from the high voltage power lines, measured horizontally?

ps. Our government deserves more than an estop, I wish them many years in jail, and I hope those times will come.