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Hi, Wersy!

This is to confirm that I have shel measured by digital caliper from Hobbyking. I have 0.42 mm average width. Measured on two different parts of your model in 3-4 different places.

About servo cap fit issue I can say next.
Measurements of height of top "box" on cap (outside). Just at corners.
Front - 5.1 mm
Rear - 5.1 mm

The same places on wing_servo parts (inside)
Front - 4.7 mm
Rear - 4.2 mm

Probably there is kind of temperature deformation due to 0.4 mm shell or sort of PLA.
I think I'll cut top part of servo walls so, that cover will be aligned just by outer perimeter (wing profile).

In my models I do inner part (which should be inserted) on 0.8 mm less then outer part. This is exactly 2 nozzle sizes, 1/2 on each side from center line (coordinates) on each part.