I just used something like a NACA 0018 or 0016, full symetric with a nice blunt LE.

Why not just "borrow" a nice wing rib design from any other plane you have, my first own design giant scale gasser I enlarged the Sig Astrohog rib 160% and it works awesome!

Now I prefer full symetric and no dihedral, for flying inverted as well as upright.

AJC