I must cut a shoulder joynt into the face sides of each shelf for the face board that will attach all the shelves to the inside of the face frame after the barrel back boards are applied. Now I attach one spacing strip (1"x 1") to the middle of the shelves in the back so I can begin to nail the barrel back boards on. Those two face boards and the 1"x 1" are exactly marked to match the scored and predrilled holes on the barrel back boards (pictures 4 and 8), essential ! Wetting, bending and nailing the back will really make you sweat ! >