Rti - i did what you suggested on mine but i used 1/8 in. oak plywood. i built a small wooden frame to mount it on and just used some longer screws to mount them to the door. those cardboard ones are really flimsy and i think you are right - if you are going to use them they need a little backing of some sort. now if i would just finish the rest of the interior! i think i have pics of mine (door panel)at http://community.webshots.com/user/djed50


54 3100 w/62 235 "Yosemite Sam"
Born a Jay Hawk, raised an Okie and resurrected in Texas!http://community.webshots.com/user/djed50