Even though it hurts, I gotta agree, this is one of these best cabs ever made for MAMEification. Nice big monitor, sturdy, huge control panel, great speakers, JAMMA, it's all already there.
I doubt you really could do better than it. At $250, it's a dream compared to spending thousands on a custom built MAME cab. Even in it's current state, you could slap a J-pac and PC in there for $100 and have one of the highest quality MAME cabs around.
*jealous*