When I got the CBS fuse and relay module I did a Coreldraw map of my wiring at full size. This was for a megasquirted MX5 engined car, but I split it up by lights and engine on their own layers so I could measure the runs etc.
Ill try and dig it out when I'm at home.
What I did when I did do my rewire was just buy large reels of black cable in different gauges and a few packs of multicoloured shrink wrap and just put the same colour at the plug ends for identification.
1.6 Mazda B6 : Garrett TBO339 : 420cc WRX Injectors : FMIC : Microsquirt V3 : LC-2 Wideband : Toyota COP
Build Started Jan 2013 : OTR Aug 2014 : Build Pictures