Did any of you folks do anything to strengthen the upper wing center section? Reading the instructions and looking over the plans, it looks like there isn't much structure there aside from the large pine block used to mount the cabanes. Glassing doesn't look like it would offer much since the underside of the wing is cut open. I was thinking about adding some spar joiners, but they too would be a little iffy due to the angle the spars meet in the center.

John