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I suppose an interesting diversion would be to hunt for the biggest one that is actually still sold at the moment! :)
It's late, but I think this is fully self-aligning set! The only parts that looked obviously suspicious are the ten "Brick 1X1 W. 1 Knob", but surprisingly, these are not a problem! Eight of them are used in the front of the rotor units in such a way that they are forced to be self aligning (quite clever, see step 83 in the instructions) and the other two are also forced to align in step 28 (and are also completely hidden from view anyway).
So the only contentious issue is the control sticks that are added at step 32, although I think it's reasonable to allow those, as you'd have to rotate them by an arbitrary amount in order for a seated minifigure to hold them.