In regards to the motor for this plane. Indeed everyone keeps screaming saito .91 for this baby but the plane is so light (even after you reinforce things with some epoxy) that there really isn't a need for the .91. I mean, if you can hover at 1/4 throttle, why not save some cash and stress on the airframe and put a 70 in it.

I have a KB .61 with aftermark carb (13x4 prop) in mine and it hovers at just above half throttle and still has plenty of juice to get me out of any trouble.

So don't fret if you don't have a $200+ motor for this plane. Any hot 50 or 60 sized 2-stroke will enable you to do almost anything. Unless perhaps you want to hover at idle.