With the thin 12% airfoil that is used for quickie I doubt that a built-up wing would be any stronger than a foam and balsa wing much less a composite. To approach the same strength you'd need to have a fully sheeted wing. Then it wouldn't be any lighter at all. If you don't use full sheeting, all those open rib bays that are covered with silk/dope or monokote will be oscillating with the vibration of the motor and the wind stream creating drag and making airfoil choice irrelevant.

If the airfoil were much thicker, say like on a fun-fly type plane, a built-up wooden structure would be much stronger for its weight. On a quickie tho, it would be much easier and faster to build with foam and balsa.

Afterthought: I weighed a set of cores for a quickie recently. All-up weight of the foam for a quickie wing was 2.5 oz. If you get rid of the foam, you have to add a spar and probably carbon fiber reinforcement which of course adds weight.