I got my box just about ready to put insulation in it. I made it 78" X 13" X 30" inside dimensions. I used some 3/8" and 7/16" plywood I had laying around, kind of a patch work quilt thing :D . Should I try to make it 88" or will 78" work. I will probably make some 66" bow later but am going to do some 64" right now, all glass. Thanks, Don