Yes I too did'nt use the single aileron servo but used seperate for each aileron. Flaps skipped adding and after years of flying not sure if they would have been used , maybe an excuise when I crash it.
Rubber bands .. true a pain at the field but it's a trainer and have saved the wing twice when my son flies it. another story.
Have a megatech 46 BB and from here it's a very sweet plane I still have fun flying.
Good luck getting it the air.