a dremal with the small brown disks is the way to go when sutting the rivets off i just finished one door panel and im starting on the other dremalls are tha shit lol.
use the dremall to cut the top of the plastic rivet off (take care when cutting the rivets) as not to brake the disks and note witch way the disk spins.
then use a utility knife to cut around the hole in the middle of the rivets
and then just pull the panel.
if u want when the panel is off is to custom fiberglass a mold of the inner panel if you want to have a custom speaker panel/anything you want in there
if you havent done FIBERGLASS before its honestly a friggin JOKE the shit is so easy to use.