I have an old Defender Cab I DIY fitted with a PC/LCD and wired up a 2 player controller + track ball into using MAME/MALA. PC Has Windows XP on it, boots into the MALA frontend. Works fine, but isn't a pristine clean new multicade or anything. Has coin door and mechs still.
It is the machine in this picture:
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In that picture, it doesn't have the trackball yet. I installed one into it later on for Marble Madness. The trackball works as a mouse in windows, and two buttons are assigned for mouse clicks.
It currently only has arcade games on it. 19" LCD monitor inside of it. Power is from a momentary button wired to bottom to boot up PC. Has coin door with mechs.
Anyone interested? I'm in Central NJ. $50.