Finish up with more shelves
Install shelves at the back of the cabinet. Measure the depth of the cabinet and subtract 8-1/4 in. to determine the depth of the shelves. Subtract 3/4 in., the thickness of the edging, from this dimension to determine the width of the plywood sides and shelves.
Cut two strips of plywood for the sides, and cut as many shelves as you want. Cut the side supports (H) to fit top to bottom in the cabinet. Then drill a series of 1/4-in. holes in the plywood sides for shelf pins. Use a shelf-pin jig or a strip of pegboard with 1/4-in. holes as a drilling guide.