I'm in the process of making my own arcade cabinet at the moment, although I am very much still in the planning stages. I've got most things I need now hardware wise but I've been tempted to add in a proper working coin mech to it, a lot of people seem to think it adds something to the experience and the more I think about it, the more I agree.
I already have purchased this coin door from
www.arcadeemulator.net the Small Door and Frame Assembly for Home Arcade Cabinet.
Is it possible to add a Happ Ultimech Coin Mech to it?
Here's some photos of the coin door in question.



