Since I'll be using the Lusid Arcade Flashback plans from the Project Arcade book, I'll need to find an effective way to mount the guns level, like on the original machine, but on a slanted control panel top.

I do have a pretty good idea though. The control panel I bought comes with no "boxes" to go around the gun mechanics, so if I could make my own custom ones out of MDF with the bottoms being at the same angle as the control panel, the guns will be level when they're mounted. I'll need to find out what the dimensions of the original "boxes" are first, though.
I probably won't be using the original control panel from the T2 game, but it could make a nice collector's item to have around.