By Chris HillMore in Bathroom
Position the main shelf 11 1/4 inches from the ends of the sides and attach using glue and #17 x 1-1/2-inch wire brads (Image 1).
Position the side assembly centered on the 23-inch side of the back, and mark on the back face of the back the positions of the sides and main shelf. Apply glue to the edges of the side assembly, and tack in place using 1-1/2-inch brads. For each side and the main shelf, drill countersink holes for 1-5/8-inch screws and drive the screws through the back and into the parts as shown in Image 2.
Use wood filler to fill the edges and ends of the back. Prime and paint the main shelf, sides and back, except for the top and bottom ends of the sides and the back. Painting the back is optional.
Position the top centered on the end of the assembly nearest the main shelf and flush with the back edge of the back and attach using glue and 1-1/2-inch brads as shown in Image 3.
Position the bottom centered on the other end of the assembly and flush with the back edge of the back and attach using glue and 1-1/2-inch brads.