(should be about 95% the same as the published videos)
Note that, confusingly, the world's +X axis goes from right to left in the drawing on the right. In other words, the bird is facing down the -X axis in the exercise.
Reference images (follow the blueprints, not these photos):
So that the exercise passes, and the spheres and cylinders look good, all SphereGeometry calls should be of the form:
SphereGeometry( radius, 32, 16 );
and CylinderGeometry calls should be of the form:
CylinderGeometry( radiusTop, radiusBottom, height, 32 );