Thanks Ma'am!
I build the peps for the actual sizing, proportions & basic general shape, then I check my reference pics & add the details. If the detail is above or embossed - then I add the card on top of the pep itself. But if the detail requires cutting, then I place a card in the interior under the area I need to modify before I cut on top of the Pep.
Sometimes, due to the numerous mods you do on a Pep - it gets reinforced so much with the addition of card that sometimes you dont have to use resin or fiberglass anymore. Just slap some bondo & sand.
Mardon (MLC)