Nearly finished interior. I used 2" foam and vinyl over 3/8" plywood to make these 3 cushions. I don't have any progress photos, but basically I just cut the plywood to size, cut a rectangle of foam the same size, and stretched the fabric over and stapled it from the bottom. I have to go around the fabric and remove staples, tighten, loosen until I got the shape consistent, but it's just tedious work. The pads had to be small enough to fit through the door if I ever wanted to take them out to clean etc. so that is why there are 3 of them like this. I used automotive carpet on the walls. Same as the foam, just cut to shape and spray adhesive to attach. I also stapled around the perimeter fo the carpet