If you're clever and have the time, you could go to the wreckers and get the ENTIRE loom from a VK or (even a later car as you'll get even more wire), strip all the electrical tape off it carefully and lay it out, then you'll need to copy your existing loom (and perhaps even improve it if you can see things with the existing loom that you arent happy with and would do differently).
I'm in the process of doing parts of mine where the wires are heat perished etc. buy yourself a good quality crimper and a fancy wire stripper that the auto elecs use (expect to pay around $25-$30 for each), if your in melbourne Jay-Dee Autocable in Bayswater have them, if you're doing a lot of auto electronics then they'll save you a lot of time and trouble (Ive got some and use em all the time). to do it yourself could cost up like this i guess;
complete loom from a VK or later $20-$40 (sounds a lot but you try buying that much wire from dick smiths or tandys in all the colours you'll need and see what it costs you!!)
Toledo Wire Cutter; around $25-30
Bellanco Super Crimp III; around $25-30
www.bellanco.com.au
you'll need these to replace the harnesses
harnesses; expect to spend somewhere between $20-$100 i guess depending on how many harnesses and looms you tackle.
or you can try and buy one but I have no idea on how much they would cost.