Servo mounting next. Airworld uses a novel approach to mounting. As you'll see aluminum straps secure the servos down (SOLIDLY). I both like and dislike this method. Back in the fragile days of analog electronic manufacture the lack of rubber vibration mounting would've prohibited. But modern electronics are just about indestructible. What the hell, if it's good enough for Airworld. . . .
I will say this: it's MUCH more convenient than servo grommets and screws and VERY secure.

The wings come with the 3mm threaded shafts mounted solidly.

I machined these little aluminum barrels (under the nut you see here) to keep the brackets from over bending. Proper length is important.