Did you look at the link in Wolfmans post #5? It looks as if there are several wire looms required, each available in different versions. I do not know what the difference between those versions is but it may not be a 1:1 swap; you may have to spend a lot of time there too. And that after paying between $2000 and $4000

depending on the versions you need.
I know it looks messy now but tidying it up and finding and correcting the faults may be still cheaper and something you should consider.
I've been faced with similar looms in cars and repairing the old one always turned out to be quicker than making a new one or cheaper compared to buying a ready made one, even considering a good hourly rate.