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James Sharman's build is nuts. He has been at it for several years. https://www.youtube.com/watch?v=3iHag4k4yEg&list=PLFhc0MFC8M...

Usagi Electric is taking it all the way with a vacuum tube build. https://www.youtube.com/watch?v=y149hLe1zYo&list=PLnw98JPyOb...

In the similar spirit, I just discovered project that builts nand2tetris computer on a breadboard https://hackaday.io/project/185131-the-hack-computer-from-na....

Wow that turned out very clean. This person must be rather experienced though. I appreciate that they laid out the design process there.

If you like this you may want to check out Ben Eater's series[1] building an 8-bit computer from 7400 series chips if you haven't.

Discrete logic IC CPU (2020)