Wahoo! Free cabinets are the best! I've modded 2 IT style cabinets. I always wanted to paint the white part yellow and do a whole pac-man theme, but never did. This is one of the cabinets I did:
Sold it for $850 I think. It was using a Pandoras Box 3 and a 27" widescreen monitor.
The other one I still have today:
Uses a PC and also has a 27" widescreen monitor. The game is 4:3, so you can see how much screen you get.
I used these 27" widescreen because I had them handy. I don't think anything bigger would fit. I sure wish I had a 25 or 27" CRT to drop in. Good find and good luck! I actually like the cabinet, and how the screen tilts back.