Hello there. This is Devin, one of the guys who is working on the Spinal Tap pinball. This is my first post here and I am posting mostly just to answer any questions or whatever. It's something we are excited about.
Methos: I would agree that we would be limited if we were using the Bally MPU and other circuit boards, but we are not. We are going along a route that will give us more more flexibility in both the rules set and displays/sounds we can bring to the playing experience.
Toyotaboy: That's a cool looking ghostbusters, I didn't know that one was around. I will have to look it up. The main answer to your question is that there were 10,000 Flash Gordons built so it is fairly easy to find one in the condition that we were looking for: beyond it's value to repair back to factory spec, but not so trashed as to be entirely unusable as a building platform. Also with that many being made it doesn't feel like we are destroying history. On top of that the angles have already been figured out, which would be a pain if we were developing from scratch, and the major pieces are already in place. Toyotaboy, if you don't mind I would like to add that question to our FAQ on our web site.