ok, i took a quick pic of one of my coin mech, without the security box to hold coins just to show you the diffrence.

see how there is the metal coin mechanisms there, it will then register the coin and drop it down through that ugly looking tan box, and drop it into the coin box below. underneath the tan box is the coin return slot, that part with the sticker there is the cheater catcher, it grabs anything that is not a authorized weight and size. this one was pulled from a old cabinet at a arcade. door and all
Mysterioii, frames alone are hard to come by, it would be better to custom fabricate one from wood or heavy steel.