Glue up and cut the two sides A to a finished size of ¾″ thick by 20″ wide by 42″ high. Follow the procedures in “Making Solid-Wood Panel Glue-Ups” detailed in chapter 1, page 16. Use a stacked carbide-tipped dado cutter to form the dadoes as well as the back rabbets on the inside face of each side panel. The dadoes are all ¾″ wide and¼″ deep. The rabbet to receive the plywood back panel D is also¼″ deep, but it has to be only¼″ wide. If you don't have a dado blade on your table saw, use a router and straight ¾″ cutting bit. The rabbet can also be completed with this straight bit, but you should have a guide system to limit the width to¼″.
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INCHES (MILLIMETERS)