Debugging the veroboards with the pile of wires between them is proving challenging. I've therefore decided to let this be a prototype, and will re-implement the circuit on a printed circuit board. I've redrawn the schematics in kicad, including the actual connectors this time. The autorouter is now very busy getting it all to neatly fit a single 14 by 58 cm pcb. This will make for a much cleaner and thinner electronics package that will fit the panel without sticking out in the back.