I see. Balsa sounds well suited for your project. Have you worked with fiberglass/epoxy?A couple are about 2 foot diameter most are much smaller. Must admit I have a thing for balsa, not sure why, maybe because its so light.
Really I'm attempting a low ar flying wing type Wing In Ground effect. My models are showing good promise. The object of the exercise is to fly without CAA being involved. I realize I have to sacrifice some efficiency for stability. I am experimenting with inverted airfoils. Really flat with windward bevel LE and delta shaped so that AC is at the center of area to minimize aft cp movement in GE.