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Measure out the desired width of the shelves. This will also be the same measurement for your ledger.
Rip down the five quarter board or MDF to 2 inches using a table saw; this will be the thickness of all your stock.
Measure and cut all stock pieces to size to create the ledger, down supports and 45-degree angle braces.
Angle the bottom edges on all of the down supports to give it a finished look, which is known as a chamfered edge.
Measure 4 inches from the outside edge of the ledger to determine where the down supports will be attached.