I am just starting to make door and kick panel patterns for my roadster interior. In the past I have always used 1/8" mahogany door skins for the panels, but it is really too thin to hold a staple, so the naugahyde can only be glued on the back side not stapled. Also, I have always screwed them onto the doors using screws that go thru the naugahyde, foam, and panel and used the vinyl covered snap on buttons to cover the screw heads. This time I would like to use the upholstery attachments that kinda look like small Chrismas trees, that fit thru a hole in the panel and snap into holes in the car door metal. The heads are very flat, so are hidden under the foam and upholstery material. What do you guys recommend for panel material, and where is a good source for the attachers???? that I have described. The man who is sewing the patterns in my upholstery panels and covering the bucket seats says that he uses lexan, but my model A doors have areas where the metal in the center of the door is higher than the edges, so I am thinking of using 3/16" marine grade plywood and gluing filler peices at the edges wherever there would be a gap. This would look a bit weird (thick edge ) when the door was open, but wouldn't show when the door was closed.Any tips would be greatly appreciated---I do this upholstery thing about once every 10 years.