I can't recall the last time I glassed the center section?? The center section isn't the weak link on the wing. When most wings fold it is outboard about center of the wing. Plane I'm building right now is just two foam halves that glue together. I'm thinking in a case like this I will go ahead and do it? Then again I just may put in some wood to act as a spar to brace them? Glass isn't really a very strong support.