Pat:

Not having access to a wind tunnel and associated gear I can't give you any pictures.

In level flight having the LE of the aileron thicker than the TE of the wing increases drag just the least bit.

Where the real advantage lies is with surface deflection.

With the surface deflected down the top of the aileron is then lower than theTE of the wing, the airflow has to "Step down" to continue following the surface. If the aileron thickness is sufficiently greater than the TE of the wing the air can flow straight to meet the aileron LE.

Maybe Minnflier can give us a graphic.

Bill.