I was going to ask, is there anything like it where you can build a physical computer out of discrete parts? but you answered that in the last remark.

I would love a physical / homebuilt computer of sorts though. Ideally with clicking switches or lights and the like.

https://m.youtube.com/channel/UCeRXQ_B5WZD3yjPly45myvg

This might be close, but I don't believe he offers a kit.