I routed and connected some of the wiring harness today. Here is the starting point. The harness is located behind the sub panel with individual cables threaded forward to their appropriate boxes.
Here I've attached cables to the pilot's side of the panel going to the GEA 24 and the panel switches.
Here is the co-pilot side with cables for VPX, dimmers, etc. I ended up mounting the circuit board with the dimmer circuits towards the top of the center bay side wall. None of the ground wires in the big bundle of black wires are labeled! Bummer, I'll have to sort those and label them.