Yes it is nice to be able to put your projects INSIDE something isn't it? You know, to hold everything together so it doesn't flop around? Discuss the techniques here!
5 1/2" long, 3 1/2" wide, and the thickness goes from about an inch near the screen to about 1/8" between the controls and the battery holder. but if you cut out the cartridge slot and the battery holder and replaced it with a flat piece of plastic you could get about 1 1/4" clearance inside the case.
im sticking a goac and a hipgear screen in my gbo case. i think instead of using the internal battery holder im just going to mount a battery pack to the back of the case. then ill have some extra room inside the case.