A well constructed outrunner consists of 2 turned parts. 15 to 20, -
Stator sheet 3 to 5, - ā¬
Changing 10, -
Magnets 5, -
5, ball bearings
These were my production costs a few years ago, until I owned the company to a competitor.
With the exception of good stator lamination, you can find good suppliers in every city.
And no, I only manufacture engines if I feel like doing it 
Greetings Frank