You don't have to make a completely new wing, you can just add shear webbing in-between the ribs. Just cut some 1/8 inch balsa to fit in between each rib, and CA into place. This will make the spar at least twice as strong. You are correct, there is little to no shear webbing in their spars. This is one of the ways they cut corners, I guess. Makes for a super light wing, but a little weaker than normal. However, a little caution--to do this you'll have to remove the covering. you cannot (to my knowledge) buy the type of covering on that wing, so you'll have to go over it with monocote or some other covering. Matching colors will be tough. i don't think you'll have much trouble with the wing. As I said, it was the only thing that actually survived my flying