Few ways i think you could MAME this cab
One could be screen and joysticks on the bottom kinda like a cocktail cab and a screen up the top for games list/jukebox
Could also turn it into a smaller pinball cab which i know isn't mame but still another option.
Could also use it for dual purpose Mame
1) Bottom is for Horizontal games and top is for vertical games
2) Bottom is for MAME and top is for MAME gunlight games could have the guns sitting on the side of the cab.
Sure there are 1 or 2 more ways to do it that i haven't thought but those are off the top of my head so it can be MAME'ed