RE: TF Elder 40
I'm not glassing the center, either. On the other hand I didn't like cutting into a perfectly good wing. I decided to line the cockpit with scrap balsa to reinforce the cockpit ridge. Looks better, too, and I can paint and seal it with thinned epoxy after the wing is covered.
Top Flite calls the plane an areobatic sport model, so I expect to be able to do at least a few maneuvers without worrying about the wing folding up. But I agree it's going to be mostly a slow, lazy performer--exactly what I'm looking for.
BTW, as you can see from the picture, the kingpost isn't yet glued to the wing. Although it's certainly not beyond my meager building skills to do something dumb like that.