Thanks Guys.

The only concern I have of permanently attaching the outer skins is I don't have a lot of room for an access panel if I ever have problems inside the door. Iwas thinking of glassing in short flat headed bolts and then (hopefully) the exposed nut will be hidden under rubber moulding to be added some day. The local hardware store here have a metal fastener that looks like a rivet when the 2 pieces are threaded together, might have to do some experimenting.