If you like this, Matt Parker's YouTube video on Dr. Nim might be of interest: https://www.youtube.com/watch?v=9KABcmczPdg

There's a Digi-Compesque marble computer on the market at present, the Turing Tumble. https://www.turingtumble.com/ Offerings include the CAD files for $15 US https://store.turingtumble.com/products/virtual-pack .

I'd like to make one but that's a lot of real estate. I wonder if it's possible to scale it down, or would that affect the physics involved?