Fabrication
read that - print it out - throw it into page protectors in a binder and keep it near you ALWAYS!
mdf is probably your best bet for a frame and a stretchy felt or jersy knit cotton (t-shirt material) is going to be your best bet for fabric, IMO
you can do the whole box this way with just fiberglass - no bondo is really needed
This guy is pretty thorough and includes tons of helpful pictures - please also check out my other post on fiberglassing in this same forum
honestly, there's a copy of this site printed out and and kept in the trunk of both cars right with the haynes manuals - its like another bible
hope that helps