RE: Shrike 40 - Questions Questions Questions
What Mike said is right on the mark; "The leading edge of the aileron should be at least as thick as the trailing edge of the wing and do not over bevel while sanding."
Even a 1/64" thicker forward part of an aileron can't hurt but thinner one can kill a fast plane with flutter.
And I agree with Eric too. For your first build, keep it simple or you may have problems and never finnish it.
Plastic spinners can have balance issues too!