Step 1 Measure and Cut Boards
On a 24 x 48-inch piece of plywood, measure 6 inches for the width and 23 3/8 inches for the length and cut into two pieces. For ease, we will name these two boards: board A and board B.
Using the same 24 x 48-inch piece of plywood, measure 2 ½ inches for the width and 23 3/8 inches for the length and cut a third piece (board C) which will be attached to board B as a shelf.