The .40 will be adequate, as long as you don't exceed the weight that the plane's supposed to end up as listed on the box. If you exceed the list weight by less than 1 lb, go to a .46. If you exced the weight by up to doubling it... you need a .60. If you intend to ever add a bomb drop or to potentially tow sailplanes, go witht he .60 anyway.

The combination of ailerons and flaps, you'll want to do in a manner similar to the Kadet Sr I have. E-mail me and I'll send digital pics.