Most of the ribs in the ailerons are not at a 90 degree angle to the trailing edge, they need to be washed out towards the end by 13mm and the left aileron will sport an electric trim tab. Check the blog, but the trim tab cut-out channel could not be made to fit properly and needs to be junked and rebuilt about 4mm higher. I did prime and rivet both flaps and the right aileron but the left is put aside until a new channel can be made.