All materials I would not care to trust keeping me so high off the ground. Its bad enough thinking about some small bolts taking some huge stresses, I'm just not a composite fan, and for real Styrofoam? Maybe good material for cushioning items in a box for shipping, but there is no tensile or bending nor shear stress capabilities with that material that I know of. And fiberglass? I've seen way to many kenworth size truck hood fender combo's with major cracking in very low stress area's.
Wing separation is a no brainer on that one.