Planning on it once the cab is done.
First decide how many marquees you want. Investigate the dimensions of each marquee (as they come in all sorts of sizes). Start collecting. Collect first. It may take a while unless you have a wad of cash. Then the box can be whatever size you like. You may want to make like 3 columns. You will need to route a 3/16 to 1/4 in. slot around the edge then slide the marquee in. Seperate with like a 3/4 in. piece of wood also slotted. This should slide right over the edge of the marquee and block any light from comming out. The trick is figuring out what kind of light to use and how many. Cold cathode would be great and low power, but somewhat costly for something this sized. Sorry if this is vague. I have roughly sketched plans that I have been toying around with.
I have a few marquees collected, but have a lot more to go.