I thought I would post to show where I am at with my car and ask a couple of questions about fastening to that hard board the panels are anchored. The board I am using is surprising the same or the same as the 1950ties stuff. I bought one of those staple guns at HF that shoots ¼ staples. My concerns are filling the door card with staples like was done originally or to use more glue and less staples because my fear is at some point towards the end the board will break because of all the staples. The fiber board kinda looks like the stuff John used. I am a carpenter, but I have never used this product or work much with light weight material. I did my seat frames with ¼ plywood and have a feel for that plus they were done originally with plywood.
steve
steve