Hi Leigh,
Just on the subject of wiring. I just bought a couple of connector kits off eBay. Pretty impressed with the quality. The connector kit comes with the crimp tool to suit. The connectors have silicon seals to keep dust and moisture out. They look very OEM and in fact one of the kits I bought is the connectors used in Harley Davidson motorcycles.
I bought This kit and the pins are rated to 7.5A per pin.
Deutsch DTM Connector Kit
I also bought this kit which has larger pins rated to 13A per pin.
Deutsch DT Connector
The project I'm currently working on is cleaning up the engine loom and the rest of the wiring. I originally used those cheap Narva plastic multi spade connectors as that was all that was readily available. I'll keep you posted on how these work out.
Cheers