THey most have changed the kit because my aileron is built up. It has 3/32 sheet on the top and bottom, 3/32 ribs, and the leading edge is 3/8 x 7/8 plank.

I think you are reading the overall description of the built-up assembly somewhere in the book. Like is probably says "attach the tapered 2-3/32" X 21" balsa aileron to the trailing edge of the wing" somewhere... Look at your plans.

-Bob George