This is not a simple Christmas Tree ! It's magical !
When you turn the wheel, all the garland and star will turn in différent way.
Mount it from bottom to top and finish with the bow the solidarise everything.
Don't screw to hard the last piece of tree if you want to turn easily.
Some tolerance are quite tight so you may need some cutting tools to make everything run smoothly.
Mount video :
Only the star needs support for the screw.
The author hasn't provided the model origin yet.