Thojo,
I attach them with three strips of strapping tape, chord wise at center, mid span, and tip, top and bottom only to hold them in place while ripstopping.

I fold the aileron over onto the top of the wing when I cover the bottom and wrap the ripstop around it. When I do the top the aileron is pinned in a down postion. The trick to getting the rsn to adhere to the aileron without pulling away is to have very little overhang. Lightly mist the strapping tape with 3M77 to get the polyu and ripstop to adhere to it.

Once dry I usually sew the hinge at several points to keep it from moving up and down at the wing trailing edge.

Good luck.