Ax will be fine just run it slightly rich and go fly it. With a trainer it will be at half throttle most of the time.

Neither the wing or the fin should make a significant difference, the aileron trim will take care of the slight misalignment and providing the rudder does not bind, operate the rudder and listen to the servo noise. If it is slow one direction or hums or ticks then you should ask an experienced modeller to give it the one over.

I have taught a number of people to fly on planes in MUCH worse states and that was before the crashes and repairs.