I ordered the 9+3 kit from here for $200.
http://rebelwire.com/rebel-wire-prod...at=Wire%20Kits
It is not making your own but, it is a really cheap and really basic way of rewiring the whole truck if you don't care to use the stock harness. They use good quality wire and are really helpful if you have questions or issues. I mention it cause it would probably be a tough price to beat if you try building it yourself.
My truck was wired like a house when I got it. Wire nuts and electrical tape.