After your end panels are routed to shape, use the table saw to cut the sidewalls (B) and the cradle floor (C) from the 1/2-inch birch plywood. These parts have some edges cut at a 15-degree bevel where they will join. At this stage you can assemble the sidewalls to the floor as shown (unless you want to paint some or all of the parts first). Apply glue to the long (beveled) edges of the floor, one at a time, and attach the sidewalls with 4d finishing nails. If you have a pneumatic finish nailer you can fire the nails directly into the plywood; if you are nailing manually, drill a series of 1/16-inch holes along the lower edge of the sidewalls as shown so it will be easier to align the parts and drive the nails. After everything is fastened, set this assembly aside for now.