advice on 94 2 door tahoe/balzer

I made a pair of fiber glass door panels for my Subaru Impreza, took of the original pannels and all the stuff conected to it (armrest ect..) and used the original panel and clay to build the shape i wanted, then put mold sealer and releasent over it and layed the fiber glass over it. once it has cured you can release the glass from the door pannel (& all the clay n stuff) and use it as a mold. clean it all out and jst put mold sealer n releasent into the mould  and glass it. again once its cured you can pull the fiberglass pannell out of the mould. if you need to (depending on how smooth you got your clay) just scuff it up and use bodyfiller where needed. this is the lightest and strongest way i could think of making it.