Sounds kind of like my setup:

Just got some 8ft. long by six inch deep finish boards from Home Depot and made shelves out of 'em, no painting or cutting involved. I, too, opted for brackets at every stud just because.

I originally wasn't going to frame it but once I started getting enough shelves I figured why not. Plus, it means the UGCs can't domino off the sides and suffer the fate that the case holding my Megaman 3 cartridge suffered. With this I can stuff 84 UGCs per shelf, leaving room for the bracket in the middle. With nine shelves that gives me room for 756 UGCs, which will be plenty for me.