I've had this cabinet sitting at our house for about 5 years. Maybe even longer, I'm not even sure anymore ! This weekend I had a good friend come over who was happy to help me with this. We're about half way now, with everything working except the joysticks.
We gave up for the weekend because the soldering iron we were using was not strong enough to unsolder the old solder points inside the gamepad we gutted for the project. He has taken the whole controller panel and gamepad with him and promised to try and work on it with another friend, with better equipment. If all goes well he will come back later this week with at least 1 of the controllers working !
So far, we have :
Mounted the monitor inside
Connected a power splitter to the power switch on top of the cabinet
Stuck the PC inside and connected the power to the screen and PC
Connected the lamp behind the marquee
Configured the PC with drivers and software. MAME + Roms are installed, but no joystick controllable front-end is configured yet.