I nailed a piece of Ÿâ? plywood to the wall. Itâ??s a real pain in the butt to have a drywall wall to work with, not only during construction but also when using the cabinet. Itâ??s impossible to attach anything to the drywall and the studs arenâ??t always where we need them to be. With a Ÿâ? plywood back-wall, I can nail or screw anything I want to it.

The side-walls are framed and then attached to the back-wall. The side walls are then sheathed with plywood. (At this point you need to use a framing square to make sure that the side walls are perpendicular to the existing back-wall.) I then attached the 2� x 6� boards that will support the roof and floor joists.
Note: I built the roof first, then the floor, because you don't want the floor in your way when you're building the roof.