One thing that I forgot to explain regarding the mating of the trailing edge of the flaps and wing...

Clamping the 1/4 spruce trailing edge and the 1/32 ply along wing trailing edge makes the spruce and the ply "slide" past one another as they conform to the bend in the wing edge. Once glued, the surfaces (generally) do not return to their original shape (flat). So, this is the real rationale for doing it this way. It's very effective, and even though most of the spruce trailing edge material is eventually razor-planed away, the flap still maintains it's contour to match the wing. The 1/4 balsa stringers and the 1/16 surface sheeting also combine to help maintain the shape when the flap is built in place.

OK, that's it. Will post again soon.

Noah