I have the HP that rrent has and it's pretty good at describing the processes involved. However, the two best pieces of referance materials I have found are the GM Factory Assembly Instruction Manual and the Body by Fisher Manual. Though these manuals don't show you how to restore a project, but sometimes just finding out how to put it back together (Assembly) and to properly align and adjust (Fisher)components will cure a lot of headaches. Dedicated wiring diagrams are available but the Assembly Manual has a general one as well. Total cost for both manuals approx. $40. I need a new assembly manual because it's worn out.