This is the 2nd of my current MAME cabs. This was an old cabinet I had with a non working monitor and a knackered control panel. It had been in the garage ages and when I picked up a spare monitor for the other mame cab the guy was getting rid of his control panel that he had made for one of his projects. I shoved an old CRT PC monitor inside the cabinet, made a new bezel and retro fitted his control panel to the cab.
This is a pic of the control panel that I picked up
A pic of the underside of the control panel