I built a 73 W100 a couple of years ago. Most of the mechanical stuff I ordered from rockauto, but everything else was scrounging for junk yard parts. Not much of an aftermarket for these trucks, which is sad because I really like the styling of them. As far as the wood bed goes, I just had a cabinet maker cut the wood for me and dry it. It was much cheaper than buying a bed kit. Here is a before and after.
