how you do it legally, is you install some of the windows classic applications on them (midway collects ect). Then you sell the cab with a few games. Heck, you could write a frontend that moved between a few of these collection applications.
almost every other option requires you to do so much work, its not worth it.
NOTE: there are a few legal roms out there... and you could sell cabs with those, after you get mame's permission. If you ask, and show what roms you are going to send with it, they have given permission in the past. It can be hard to get a reply I hear.
btw, there is very very little money in this. Lots are doing it... and lots are trying hard to find people with a few extra K laying around who will shell it out... especially when the cab is in a legal form... I would recommend just doing it for love of it, and for friends.... If you want to make money, consider moving to the component level. I hear there is good money in reproductions (spinners ect) and encoders. But there is a lot of choices now. Not sure how easy it will be to get a nitch (without it being stolen away by the others in the group).
btw, the first person to come up with a cheap starwars controller will be working full time for 1/2 year filling orders. If someone could do it for 100 bucks, they will be working full time for the rest of their lives.
