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Use the chop saw to cut 4' long sections boards. Cut two 4' standards from 2x4 stock. Finally, cut 1" dowel rods to 7" lengths.
Place 2x4 standards on the wall two feet apart. Secure it to the wall with 3" wood screws. With one screw in, check for plumb and attach it at every high point on the board.
Use a 1" Forstner drill bit to drill four holes on each standard. Each hole must be 3/4" deep to hold the rods. Apply wood glue in the holes and the end of the rods and insert the rods into the holes. Tap them into place with a hammer as needed.
Use a small wood bit to drill through the center of the dowel rods. Place a 4' shelf atop the rods, ensuring a 1' overhang at each end.
Place a torpedo level on the shelf and adjust. Secure it to the rods with 2" screws.