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This was one of my first "multipart" Gravitrax designs, and one of my favorites because of the way the marble "clicks" at each step... When I designed this I was a bit worried that a vertical descending staircase would loose too much height all at once, and that's where the idea of the cannon came from...
The idea of chaining staircases is absolutely brilliant, it would also be cool to print a staircase "mirrored", so that the two spirals go in opposite directions! :)

My favorite part of the video is the "YESS!!" at the end, I can imagine your son's clenched fist and broad smile, and that's the reason I design this stuff... :)