roll pan on 94 ranger styleside

i have a 94 ranger stylside that i have already bagged and shaved slightly... i'm starting on the back end in late february and i have a few questions. arent some of the stylesides fiberglass? if so how would you mold a roll pan onto a fiberglass bed. then i would have the same problem with shaving the taillights b/c both are made out of sheet metal. im going to be getting my parts through fbi rides does anyone have anything bad/good tosay about the quality of that company?

dont get fbi tail light fillers they suck! they dont fit worth a crap.grant customs hands down all stepsides are fiberglass sides w/ steel inner bed.

what i plan on doing when it comes time, is using the tailights, laying glass over them to get the mold and then mold them in.

for the pan and tailgate I plan on doing the same thing, except buying a rollpan that isn't destroyed, making a mold of it and then selling it.