The Hobby Hangar kits are good fliers, but can tip stall on landing if you aren't careful. If you go with the bigger engine, I would use spruce spars instead of balsa. I had a Magnum .61 4-stroke in my D-7 and broke the top span on the bottom wing. Nothing drastic since you have N-struts and we replaced the spar and re-covered. On the SE.5, we put in spruce spars.

The kits are pretty non-scale with ailerons on the lower wings. On ours, we used 4 ailerons, top & bottom wings, with 4 HS-81MG servos. I was flinging mine around the sky with lots of violent acro and high-g maneuvers so if you build stock and fly scale you probably won't have any trouble.