The backing, which seems to be a derivative of Masonite, does tear out. I have had success using 2 X 2 inch squares of fiberglass matt (the woven stlyle) and glassed the clips to the back of the panel. The main issue there is you need to work one at a time, quickly as the resin dries, and, you must align the clip to where the hole in the door is - unless you plan on drilingl in a new hole.
The face side, from my experience is a crap shoot. I have seen some at swap meets done, and seems the sellers can not rember by who. Hopefully somebody will post a "who"about them.