Thanks!
It's stable enough to pick up and even play a bit but don't be too rough on it and hold it from the bottom. Dreadwind is most of the bottom base as well as the landing gears and his legs somewhat 'cradle' Darkwing/Silverbolt in place. The top bit locks in place by sliding the back bit of the movable back plate (where the rocket boosters attach) into the gap formed at the front when you fold back Silverbolt/Darkwing's nose and cockpit. The rocket pack's boosters also help to keep the assembly in place by fitting between the folded cockpit and body of Darkwing.
If you do it right it will lock in place well enough so that it doesn't fall apart by someone just looking at it.