After the panels were cut, I wood glued together to form the box. Without carpenter clamps, I had to glue the panels in batches. Since they were glued at different times, I had to make slight cuts with a track saw to get the box to fit nicely as I was assembling. After the glue had set I used a hand sander to smooth surfaces that were rough and Bondo to fill in edges were panels were butt jointed.