I am ALMOST finished scratch building a 40 size Taube from Balsa USA, I just cut a set of ailerons into the outboard section trailing edge and used bell cranks to operate them, no idea if they will be very effective I had nothing to go on, QUESTION, no where in the instruction do they mention that you had better put the tank in place before you cover up the front deck, there is no access afterwards, I opted to make the whole deck removeable rather than glued to the wing Mike