Thanks Korben, I don't do any vacu-forming although I want to build a machine one day.
I made the main wing from foam board folded to make the airfoil. Then I wrapped it in 10.0 styrene and layered it with panels etc. The top piece is a combo of plastic jars, ribbed styrene, a plastic Easter egg, a silly putty egg and some tank tracks. I use the Lowe's for sale signs for my main plastic source. They are about .036 thick and work quite well for basic shapes.
If I make a hollow shape from styrene and need to reinforce it I use "Elmer's Damaged Wood" from Lowe's. Its a 2 part epoxy resin that mixes just like Aves epoxy sculpt. It cures to a rock hard smooth finish with no shrinkage and no smell. I pack it into my hollow styrene form and the next day I can sand it to any shape I want. (very similar to wood).
As for reference, I just used each and every pic from the internet and the RPF of a B-wing (that I liked) to use as a guide and size/proportion scale.