Here's the coin door and bottom board pics

The item missing off of the bottom board is basically a half moon credit unit. This is a factory option allowing the storing of a credit, ie 2 plays for a quarter and then it turns on the credit light on the apron. Certainly not needed but these do come up on ebay if you wanted to add the feature.

The wiring is there for a coin counter, another factory option but I rarely see these in AAB games.

also coin door do come up on ebay as well (none currently showing). Even if you see a silid state door the coin eject hardware is the same. The biggest item is getting the eject button setup on the door to make it look complete.

I have purchased a couple of doors myself but they have been expensive $100+.

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And here's a half moon credit unit

ebay.com link: itm

You basically discard the disks that show in the backglass and it will store the credits. I can give you the wiring if you wanna add it.

Marco carries the isolated lamp sockets needed for a coin door. I can make you up a harness if needed.