I wouldn't get too worked up about the wing servos. You can either lay them on their side with a hatch, or use a low profile aileron servo and screw them straight down into suitable mounting rails.

I did beef up the wing and fuselage strut mounting by doubling the light ply with 1/32 ply on both sides.

I'm not sure why you need to beef up the fuse over the bottom wing. Your choice.

I'm finding that the recommended C.G. range is way too far forward. I'm moving mine to the rear cabane or aft. This forced me to move my batt to the tail.

Ditto on the plastic cowling. Not worth the glue to assemble it, much less paint it. Fiberglass is required.

Use a strong servo on the rudder and elevator.

Saito 120 offers very strong performance.