make it modular..build a floor...4 walls, and a roof that come apart with minimal screws...also, if your right handed ..put the window on the right side, so you can build a bench in front of the window to rest your gun on and have a good shooting rest..like said befor..i wish it was bigger...2 people...want enough room to lay on the floor and take a nap? i would say 7 feet long and 4 deep..bout 6-7 feet high...up in the air..swing the door in..on the ground, swing the door out.