For the sides I decided to go with FRP panels from TPD Trailers locally. It would then match the appearance of my trailer and give me that smooth seamless side I wanted to achieve. The corners we had built are pressed over the top of the siding to allow the panels to be secured on the ends. Each center wall section is secured using 3m tape that TPD uses on their trailers.
Paint the corners and the box is ready to sit on the frame...
