Attach the sides. Cut the side stretchers to length and connect the cabinet sides by attaching the stretchers to the ends of the panel cleats. Position bottom stretchers at the front and back of the cabinet. The back stretcher is flush with the tops and bottoms of the panel cleats, and the front stretcher is flush with the top edges of the cabinet sides. Fasten with glue and 1-1/2" wood screws. Attach the remaining stretcher at the back of the cabinet. Attach the floor.