I was able to purchase high quality frame molding in length to make 16" by 60" frames for my panorama photos mounted as gallery prints. I mitered the ends to fit the photo. Although I bought a corner joiner in order to press fasteners into the corners, I wasn't able to accomplish this due to the hardness of the material--ash. I held the frame together with a band clamp and glued the joints. Then I used 90 degree brackets on the back for rigidity. Below is the finished frame.