GD, you should start making custom harnesses so people wont have to yard out old stuff. There you go, make a kit and sell it.
i don't think that would be very lucrative, probably not even worth it for either party in fact. especialy not worth it (imo) when you consider the harness can be bought from a yard for $10 - $20 around here. i'd rather spend the time on it than money and come out with intimate knowledge of my car.
i think that if someone wants to do the swap they should do their own harness. gave me a much better understanding of the system and made me much more comfortable with working on it and all auto electrical in general.