**As promised in the comments of my previous post that presented the unwrapping of this Christmas gift, you will find at the end the video of how it works, and it's really incredible the ingenuity of the person or the computer that created this 3D puzzle.
I first show a few steps of the construction:**
A short video of this intermediate step:
At this point my wife decided to start a puzzle as well and took up half the workspace, but I didn't mind too much.
Here it is finished and the operation in video, thanks for following my post.