Plywood is used sparingly, but as you see here, this walnut faced plywood will become drawknob banks. The banks, as the name suggests, will hold the drawknob units that turn stops on and off. The larger cutouts are for control devices for the combination action and the record/playback unit.
While the drawknob banks are easily removed, inlays of babinga (African rosewood) and maple are inserted to delineate the separate divisions.