Lonnie Mihin worked in the engineering lab at Alvin G doing cable layouts and mechanical assembly design. He describes what we are seeing in two of the images presented here:

The Pistol Poker heads were not part of the original prototype. The games were being transplanted into new cabinets. The prototype that is on the right that you can barely see had very large holes cut out of the sides of the cabinet so it could be accessed while the playfield was still down. The same goes for the missing front door. We did mostly mechanical assembly and layout testing on it. It was near impossible to make the ramp shot from the upper left flipper. That was how you loaded the balls into the lock and was also the jackpot shot. Michael (Gottlieb) wasn't happy about the shot not making it around and Wally (Welch) tried everything he could with flipper placement. It just wasn't going to happen without redrawing and retooling the ramp. There was no way that we would have had a new ramp and the game ready for the ACME show that was only three weeks away.

No production games were made. I know this as I purchased the prototypes when AG went out of business.