To complete the frame, you need to make joints at the ends of the frame pieces. You can use any type of joint, but we chose a simple lap joint. The simplicity and antiquity of the joint seems appropriate. Use a miter gauge or a crosscut sled and make repeated passes to remove the necessary material. We simply set the table saw blade up half the thickness of the frame pieces. If you have a dado blade this process will be faster. If one end of a piece has the lap on the top, the other end should have the lap on the bottom; the best way to prevent making a mistake is to mark all the material that needs to be removed.