I recently rebuilt 2 pinball cabinets (1 Williams, 1 Gottlieb) - the person that I got them from left them outside for years and they were falling apart. But there was enough there that I was able to construct entirely new cabinets. In the process, I developed a lot of templates and guides. I also wrote a lot of stuff down - I do have all of the information, but it's not in an easy and convenient internet format.
The only thing that I get suspicious about, is the patent/copyright. I know all the manufacturers made their cabinets slightly different to avoid this. Now if the document was "for reference only" and I made no guarantee about it's accuracy - maybe intended for pinball owners that wanted to replace specific parts.
I might be persuaded to post this info if there is enough demand - or if there is someone who's skilled at autocad and promises to take my notes and turn it into a true plan.