I wouldn't wast my time with a quad coin door. Lets face it, with a three sided cocktail table , most of your time will be spent on two player games, and even if you play some of the four player games you can find a way around a four coin slot coin door.
For aesthetic reasons and practicality I would search eBay for a clean coin door. For me, I love knowing the fact that my coin door was used for many years as a Space Invaders coin door. Find a door with some history and renovate it. This will add to the nostalgia.
