You are better off building the ailerons separate. I just completed the Low Andrews Aeromaster Too (53/53 version)and the GP Aeromaster 60 (53/53 version) this winter. I built the ailerons separate. The SIG Smith Mini-plane requires the ailerons to be cut out ala Aeromaster also. I built one about 10 yrs ago and was very dis-satisfied with the result. I think building separate is easier and you don't have to worry about a bad cut cracking the wood or breaking something.