My new wiring harness arrived from Vinwire in Oz today. Haven't checked it out fully yet, but it looks top quality. And Paul was really helpful too.
Note this is for a Chev 12 cab Quad, but should be ok to use with my 11 cab C15 (same wheelbase) with minor mods.
Time to check out the 11 cab vs. 12 cab wiring diagrams.
If I notice any problems, I'll post them here.
Owen.