Yup, I did mine from scratch and used the schematic Cas posted for a guide. Eventually modified the schematic to allow for my MSD box and other assorted goodies. I'll look and see if I can find it electronically.
One other thing I did was to run external grounds from all electrical components on the engine (i.e. short ground from the alternator to the block, short ground from the starter to the block, ect...) that way I hope to always have the best possible ground.
Good luck