I'm not sure I understand what's in this "museum" aside from games to play. Is it going to have exhibits that relate to pinball as well as games? Or is it just a pinball arcade? Are you going to have background information on all of the machines so that someone can learn the history of each machine? (ie: Terminator 2 doesn't have the T1000 because it was a secret). What makes this a museum vs. an arcade?
Or is there both a museum section and then a "play" area at the end? If so, I would expect some sort of gift shop but not sure what you're selling.
Maybe I'm overthinking the terminology...