@AntoPISA: I will send you a detailed Picture of the cab and good pictures of the pcb's!
Quote: I thought the "Unknown Model Racing Gun Game" was "Super Shot". It now looks like it must be "Gun Champ".
it looks like the "Unknown Model Racing Gun Game" could be "GUN CHAMP" or "CLAY BUSTER"!...it's definitly running on an "CLAY BUSTER" board...but the emulated game doesn't really look like "CLAY BUSTER", as you can see it on this flyer (http://flyers.arcade-museum.com/?page=thumbs&db=videodb&id=3413)
so actually it's not clear what game it really is!