With the dadoes cut, we can cut the board to create the back and bottom panels. We measured the width of the vertical panels, and use this to determine the width of the bottom. We let the verticals be a little proud - 1/8" (3.5mm) in the front and the back; since our vertical panels are 8 7/8" (222mm) wide, we cut the bottom panel to be 8 1/2" (215mm) wide. The width of the back is not functionally critical and will be out of view once items are stored in the organizer. We simply used the remaining piece for the back: approx. 6 1/2" (165mm). You can also have two or more backs, but of course this complicates the assembly process. Once the back is cut, you can also give it a shape on the bandsaw as shown in the design considerations section of this plan.