3. Use a pneumatic nailer to assemble all of the pieces. Be sure to wear eye protection any time you are nailing, whether with a power tool or a hammer. Attach a couple of 1x4s to the cabinet to act as supports for the countertop (figure B).4. Since the countertop will cover any holes you knock in the wall, use a hammer and nail to locate wall studs. Or use a stud finder, it's up to you. Attach the cabinet to the wall with 2-inch screws, securing the screws into the studs (figure C).
5. Make a mark at the location for your nailer and draw a level line across the length of the wall. Set the 1x4 nailer onto the wall, lining it up with the level line and secure it to the wall with 2-inch screws driven trough the nailer and into the studs (figure D).
6. Secure three 2x4s to another nailer and then secure this assembly to the wall and on top of the base cabinet to serve as your countertop framing (figure E). This support system will bear the weight of the countertop.
7. Cut the 1/2-inch plywood to the size using a circular saw. Remember to wear safety goggles and a dust mask whenever sawing lumber. Set the plywood on top of the countertop framing. Secure the plywood using 1-1/2 inch screws, driving them through the countertop and into the 2x4 framing (figure F).
8. Mark the location for the sink cutout. Drill an opening inside the cutout with a drill and paddle bit, then cut out the opening with a jigsaw.