Nice machine!
I'd get the appropriate foil-cal for the coin entry bezel. It obviously won't be an ALL-original anymore (if it matters that much to you), but it will definately add to the overall beauty of the machine and the reproductions are very nice copies.
What is that box on the right side of the main door liner?
In case I want to go the free vend route, any easy way to rig this to free vend?
On the right side of the mech visible through an oval cutout in the backing plate, you will see two 6-32 screw holes parallel to one another.
Screw a screw into the front hole and the nickel dog will lift up (if a dual dog mech).
Screw a screw in the rear hole and the dime (or 10c dog) dog will lift up.