When that little voice goes off in your head, listen.
When I was rivetting up the bottom of the aileron with the pop rivets, I kept thinking it looked really funny. Couldn't figure out what was wrong.
Finally got it all assembled.
SHIDOOBEE. I had laid the rear skin over the leading edge skin instead of vice-versa. I had to drill out all the pop rivets and half a dozen regular rivets, rearrange the skins, and re-rivet it.