Vic, just cut out all that old nasty floor that was put in and do it correctly. Grind or chip of the fiberglass resin, cut out the panels and reweld new relacment panels in. If that not possible, cut out the old ones and make new patch panels with shetmetal and weld in, put some por15 or any kind od paint to seal them off from the world and your set.
HK
HK