Spent the weekend working on my door panels for my coupe. first time I did any interior work like this. using Sintra sign board I cut out panels to fit the door. Because the latches on my door stick out away from the wood frame (old chevy all wood) I used two layers of backing then glued 1/8" foam over the panels. After that dried I cut the door fabric which matches my seat fabric and using 3m glue rolled the fabric flat then pulled it tight on the back side.
Took quite awhile to do but came out better than I thought it would. SC