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Depending on how much plywood you have left over, you might decide to fashion a set of simple stiles and rails to give your door some added depth. If your main door panel is 80 inches (200 cm) tall and 25 inches (64 cm) wide, you should have enough material left over for about 4 80 in (200 cm) x 4.5 in (11 cm) sections and 6 16 in (41 cm) x 4.5 in (11 cm) sections. Keep in mind that you’ll need to put stiles and rails on both sides of the door. Consider buying a second, smaller sheet of plywood to make sure you’ll have enough and account for possible waste. Apply 2-3 stripes of adhesive down the length of both sides of the panel. Then, line up an 80 in (200 cm) x 4.5 in (11 cm) strip over either edge and press them down into the glue. Keep steady pressure on the stile pieces for 3-5 minutes, or until the adhesive has set enough to hold them in place.  It may help to clamp the stiles to the door panel using a vice or a pair of table clamps. Not only will this keep pressure on the plywood pieces while the adhesive sets, it will also leave you with both hands free. Once the adhesive has set completely, turn the panel over and attach the 2 remaining stile pieces to the opposite side. These sections will serve as your rails. Once you’ve cut them, they’ll fit right between the stiles, which should be exactly 16 inches (41 cm) apart. Measure and cut each of your rails separately to make sure they all come out the same size. Apply 1-2 lines of glue on the backside of each of your rail pieces and position them in between the stiles at the top, bottom, and center of the door. Clamp one set of rails at a time before moving onto the next set. Remember, you’ll need to do this on both sides of the door.  To make sure your center rail is situated correctly, draw a line widthwise through the midpoint of the panel, or the 40 in (100 cm) mark, and use it as a reference when setting and gluing the rail. Use a heavy object with a flat bottom to serve as a makeshift clamp and maintain pressure on the center rails. If you want to give your door a more polished look, purchase a few feet of wooden moulding in your preferred style and cut it to fit along the inner edges of the panel where the stiles and rails meet. In total, you’ll need 8 33.25 in (84.5 cm) pieces and 8 16 in (41 cm) pieces (4 for each side of the door). Glue these beside the stiles and rails.  Saw the end of each section of trim at a 45-degree angle. That way, all of the pieces will fit together easily with no need to adjust their length. You can also use 1.25 in (3.2 cm) finishing nails in addition to your construction adhesive to provide added security.
Cut your remaining plywood into 4–4.5 inches (10–11 cm) strips. Attach the stiles to the edges of the panel using construction adhesive. Saw your remaining plywood strips into 6 16 in (41 cm) sections. Glue the rails into place on the door panel. Add decorative trim to give your door more visual appeal (optional).