1
Build the frames. Use 3-in. screws to assemble the frames that support the top and the shelf. To avoid splitting the 2x4s, either drill pilot holes or use self-drilling screws. Build both frames and set the top frame aside.
2
Attach the shelf boards. Attach the outside boards first. Then position the two remaining boards to create equal spaces between them and screw them to the frame. Before driving screws, drill pilot holes with a countersink bit.
3
Assemble the legs. Drill five holes about 2 in. from the edge of the pegboard with the countersinking bit. Spread a bead of construction adhesive on the legs and attach the pegboard with 1-1/4-in. screws. If glue oozes through the holes, wait for it to dry. Then shave it off with a sharp chisel.
4
Screw the legs to the top frame. Apply construction adhesive where the legs contact the top frame. Then attach the legs with screws.
5
Add the shelf. Rest the bench on one end. Slide the shelf between the legs and line it up with the bottom of the pegboard. Screw through the shelf into the legs.