I love the look of the classic pinball machines, the old Spider-Man and the old Hulk machine. Are they called boxhead or wedge head machines ? Anyway, I dont want to take away from this. This project is amazing! My wife would like a pinball machine and me liking "machines that play multiples" something like this would be AWESOME!
Personally I have no room, skills, or time to do such a project. I can only dream.
I do have 4 Nintendo machines, Mario Bros MAME, Popeye 138-in-1 Jamma, DK with a 60-in-1 and DK JR with MAME. On average I'm into the machines for between $350-400 each.
I'll look for that thread you mentioned, I'd be very interested to see. Perhaps one day I'll find a nice gutted classic. I'm not scared of the hard work, its fabricating stuff that I'm no good at.