Thanks guys
I'm definitely no expert. The reason I made the molds was soley to vacuum bag the parts which made them lighter and stronger. I wanted sealed air space for midwoofers , I could not find a way to do this with mdf without the panels being stupid heavy. My car will not be a feather weight when its done but I simply refused to make 50 pound panels.
If your just making a specific shape and have no need for a double walled panel, I'm sure you can make some from mdf that would be a reasonable weight. As for mounting the I 'm using screws through the door pull hole and speaker access. If you look at the pictures the door pull screws directly to the mount which attaches to the door itself. Your never actually pulling on the door panel itself. the panel could just mount with screws but I did not want it to vibrate so the outer perimeter has the same material used to mount an Ipass to your windshield . Its strong stuff.
There is an interior thread on here started by the recovery room where he shared a few tips abut making the base panels from aluminum and how to mount them. There work is simply incredible and picking his brain would be the best thing you did.