I bought mk4 with the intention of doing a multi jamma, plus jpac running mame. Don't know if ill ever get to the multi jamma but the mame portion is coming along. I saved the original mk cp just so everyone knows. This is the same size but 7 button and an extra inch between the sticks and buttons. I'm going to try to get a trackball in there too. I broke the plexi drilling it or else it would be way closer to done.Lemme know what you think.