Tonight I finished routing the wiring harness. I was able to connect the headset jacks, the control stick, and the flap motor. Still to-do is the flap position sensor, the baggage light, and then working out how to tension the wires to stop them moving around.
Most of the work was a repeat of the right hand side. The time was spent fishing wires through the various ribs, then installing bushings. Because the connectors are already installed on the harness, the routing needs some patience. It also means the the bushings all need to be sliced in one place so that they can be spread apart and installed over the wires, then inserted into their locations in the ribs.
The flap position sensor is on backorder from Vans, but installation looks simple enough. The baggage light needs some thought and research, as this is not in the plans. I need to decide where to route the wires, where to place the light(s), which light I need, and where to locate the switch.