Once you have the pocket holes drilled, place the 16-½-inch edge of an end piece on top of the bench bottom, aligned with the edge. Leave ½-inch overhang on the bench bottom, secure with wood glue, clamp to hold still, and finish with screws. Repeat this process with the other side. Measure in 15 inches from the inside of the piece you just installed, and secure a divider panel in the same manner. Measure over another 15 inches and secure the final divider. Line the edge of one of the 1x2-inch trim pieces up with the outside edge of the bench, and secure it with wood glue and a nail gun with 1-¼-inch nails. Repeat on the other side. Center one over a divider panel and secure in the same manner, repeat on the second divider. Once installed, add base shoe along the front and exposed side edges securing with a nail gun. Once you have drilled all the pocket holes, place the 12-inch edge of an end piece on the bottom board of the shelf and secure with wood glue and screws. Make sure it’s on the side that will be in the corner. Repeat this process on the other side, with the 12x15 piece, keeping the front edges flush, allowing the 1 inch to hang over the back side of the shelf. Measure to the center of the shelf and install the divider in the same manner. Once you have the sides and divider installed, flip the shelf over and align the front edges with the front edge of the shelf top, leaving the 1 inch of the long side hanging out the back side of the shelf. Once they are lined up, secure with screws in the same manner as you previously did on the bottom piece. Using one of the 1x2 trim pieces, line the edge up with the outside edge of the shelf and secure it with wood glue and a nail gun with 1-¼-inch screws. Repeat on the other side. Center the last 1x2 trim piece on the center divider of the shelf, and secure it in the same manner. Align your 15-inch 1x3 trim piece with the overhang from the from the front trim piece, along the extra deep side. Cut crown trim to length for the front and one side of the shelf. Attach with a nail gun and 1-¼-inch nails. Measure up 3-½-inch from the bottom of the shelf and secure the narrow side one piece of the cleat to the back of the dividers with wood glue and 1-5/8-inch screws. Align the top narrow edge of the other cleat to the top edge of the shelf and secure into the top board of the shelf with wood glue and 1-5/8-inch screws. Secure your base shoe along the top and bottom of the bead board and along the outer corner where the panel meets the wall with a nail gun. Fill wood holes as needed with wood filler and let dry. Once the wood filler has dried, sand smooth and remove all sanding residue.
