Following the excellent advice I received from everyone; I framed up two new ailerons, built up the leading edges with 1/8" stock, rounded the LE, and installed tri stock to "clean up" the "step" created between the 1/8" stock and the aileron frame.

The aileron on the left has the 1/8" stock installed, but not the tri stock. I believe the "step" created by installing the 1/8" stock is visible. the aileron on the right is completed.

The reason I added the tri stock is: I thought that the "step" would created an area of low pressure, and thus turbulence. Was I correct in my thinking?

I should have mentioned that this is a Tower Uproar .40 "Club Pylon Racer" to be powered by a TT Pro .46. I have probably defeated my purpose by adding the additional weight to the ailerons, but perhaps the increased weight will be offset by more effective control? In any event, this has been a worthwhile experience and I have learned something.

I would appreciated any comments and suggestions. I hope that reading through all of this has not been too tedious. Again, my thanks to all for the comments and suggestions.