I have made some minor alterations to the wiring diagram I posted a few weeks ago. Mainly modifying some earthing wires, and adding in an additional earth wire for the metal control panel.
Here is version 3 of the wiring plan for the cab:
I also put together a quick high lever overview of the wiring. This will show what components are going on which mounting board and where the general flow of wires will be. It is missing the speaker wires, which will run off the harness. The service buttons will sit beside the coin door (inside). The power board is mounted to the floor and the pcb board is mounted vertically on the side. A good example of this can be found here.