I'll play, but I don't have much. the Big "surprises" were the sales points when I saw it first. The single suck through turbo and the cluster of gauges. besides the factory under coating, it also had a spray of something amber on underside and wheel wells.
after driving for couple years, then disassembled for couple decades, I only discovered I had three 8 X 15" wheels. I guess there was a curb rash incident.
the "Mystery" I wish I could get more info on would be the original owner. the bits I have pieced or fabricated myself. An Engineer in Ft Laderdale had a buisness to make turbo kits. there was a corperation formed. but it looks like the Engineer passed shortly after purchasing 5177. I did reach out to the corperation secertary, whick now is a wealthy realastate agent, but she ignored my request for info.