Rob, I used a Commodore harness and ecu, modified to suit.
I deleted all the BCM items and anything else not needed, using the PDF it was fairly simple and I did it one Saturday arvo.
If you get a genuine harness from a wrecker I can send you a copy of PDF.
I found it easiest to pin it all to a large cardboard sheet and lay it out and label as I went, anything not needed was cut out.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.