Lay out the dadoes of the sides, middle shelf, and bottom shelf, as shown in the Side Layout and Section A. Cut the dadoes with a dado cutter or router. Drill the holes in the sides, dividers, and cleats Drill the holes needed. The spacing of the holes in the cleats is not critical, but it should be fairly even. Assemble the face frame. Use two plates in each joint for added strength.
Finish sand the face frame members, then join the parts with glue and plates.
After the glue dries, sand the joints clean and flush. Where you ve joined the mullions to the rails, the plates stick out on either side. File these plates flush with the edges of the face frame members. After you cut the slots and assemble the frame, the biscuits will stick out on either side of these parts. File the visible biscuits flush with the edges of the members.