I'm constructing a canard rc plane, and making the wing out from depron.
The wing span is 40in, root chord is 225mm and tip chord is 150mm.
In order to achieve a good stifness,I opted for conventional construction, using spars, ribs and skins.
The spars are made of fiber glass with paper honeycomb core, 3mm (1/8in) thick. Supplier info is on the atached photo.
Upper and lower surfaces are flat, from depron 5mm (3/16in) thick, while the leading edges are solid sculpted from depron 1in thick.
The wing profile can be seem on the attached photo. No leading edge yet. Very easy to make, I reccommend to draw the parts in auto cad, or similar, and print a drawing to use for cutting the parts.
The wing box rendered an extremely stiff structure, thanks to the honeycomb spares.
If you want to know more, contact me.