This is cool, but those of us of a certain age have been there, done that, before. For that young feller, building a computer from scratch with a microprocesser is an exotic affair. For me (and many others) in the late '70s and early '80s, it was the norm. I've designed and built dozens of these – and that's not bragging, that's just the way you did things back then.
There's a further step I'd love to take. It's been on my “to do” list ever since Don Tarbell showed me his home-brew 8 bit computer back in the late '70s. He didn't start with a microprocessor chip – he started with a blank sheet of paper and a TTL parts catalog. He designed the instruction set, the CPU architecture, and every logic gate in the entire thing. The result was something that would (barely) fit on a table-top, and operated at a speed that would be most unimpressive today – but it was all his design, from the instruction set on up.
I want to do that. And someday, I will.