nope...it's all custom.
it's fairly easy, its just VERY time consuming.
sand everything down real smooth or use bondo or another body filler and sand everything down as smooth as possible. primer, paint. for painting..a professional should be used, or someone who has access to a body shop paint booth..for an even coat. obviously don't brush it or use spray paint, the coats will come out uneven and it'll often run.
and as long as you aren't modding your door panels or dash..then you really don't even need fiberglass. you can just use body filler to make everything nice & smooth. or you can use polyester or epoxy resin with a filler added..doesnt really matter.