Cut two 36-by-36-inch pieces of 3/4-inch plywood with a saw, then cut two 22 1/2-by-36-inch pieces.
Assemble the four pieces into a 36-inch-tall box, with the shorter pieces sandwiched between the larger ones. Clamp the box together with bar clamps.
Drill a 1/16-inch pilot hole every 4 inches along each corner, then secure the box together with 2-inch wood screws.
Drill a 1-inch hole in the side of the box near the bottom. This will allow you to pass a power cord through.
Cut a 24-by-36-inch piece of 1/2-inch plywood. Cut another piece of pegboard to match the same dimensions.
Bore a hole in the center of the plywood with a hole saw. The diameter should match the hose on a shop vacuum.
Insert the vacuum hose into the hole and glue it in place with epoxy. The end of the hose should be flush with the plywood's surface.Glue both sides of the hole to ensure that the seal is airtight.
Place the vacuum into the table base box, with the cord passing through the drilled hole. Its power switch should be in the "on" position.
Place the plywood on top of the base. Its edges will line up with the sides of the box.
Drill pilot holes every 4 inches around the perimeter and screw the plywood to the base with 2-inch wood screws.
Cut 2-by-2-inch boards into two 22 1/2-inch pieces and two 36-inch pieces.
Assemble the pieces into a box at the perimeter of the plywood. This forms a riser that will keep the plywood and the pegboard separated.
Drill pilot holes every 4 inches. Glue the 2-by-2-inch pieces in place with epoxy, then screw them in place. This will form another airtight seal.
Cut six 2-inch pieces of 2-by-2-inch board, forming cubes. Evenly distribute these across the plywood surface to prevent the pegboard from buckling when the vacuum is turned on. Glue them in place with epoxy.
Place the pegboard onto the table, which will act as the finished surface. Glue and screw it in place the same way that you did the plywood.