The servo arm is not pinned but simply glued, actually with a thin film of Gorilla glue, and clamped until it has set. The glue foams slightly so builds up around and through the servo arm holes ensuring a secure key.
Glue may not sound adequate but you have to remember the aileron itself is built up with only 2mm Depron and nothing else!
It will be a 'dual aileron' set up so the travel of each servo can be adjusted individually from the Tx and most likely with some differential action as well.
The fuselage 'bits' cut out in 3 mm Depron.
Construction is admirably simple as the major part of the fuselage is parallel.
The top decking is 'planked' in 2 mm Depron.
The fuselage underside sheeting is also 2 mm.
The original Ballerina had the undercarriage fixed to the wing which required significant local reinforcing. To do the same with a Depron wing would be proportionally heavier so the undercarriage is fixed to the fuselage with large acetate side plates to spread the load.
The wire is fairly thin so it gives quite a soft and springy undercarriage which also reduces the shock loading.
The tail wheel is mounted in a similar way.
A cheap and cheerful 1200kV Emax 2822 with a 9x4.7 SF gives about a pound of thrust but only draws 10.2A (120W) from a 3s LiPo.
As I intend using a 1500mAh the battery will not be worked hard.
Sitting on it wheels.
The 2.25" (57 mm) wheels may look quite chunky but they too are made of Depron with acetate centres. Each main wheel only weighs 2.8 g!
One advantage of such a lightweight construction is it only requires modest power.