No graphic needed Ken, I think your description sums it up well. No fiberglass needed either, not for a firewall anyway.

To answer one of your other questions, the adhesive the hobby shop was talking about is not really for structural adheasion. If it's what i think it is, he's referring to a simple spray adhesive. The idea behind this is simple: If you were going to fiberglass a wing center section, you would get a (roughly) 3" wide band of FG cloth. Spray the center section LIGHTY with the spray adhesive and put the cloth in place. The spray will hold it while you get all of the wrinkles out and make it conform smoothly to the shape of the wing. Now, you can wet the cloth with fiberglass resin (which will penetrate down to the wood - one reason not to use too much spray)