They already did: https://www.commanderx16.com/
you just probably want something better.
and that is the problem building higher performance requires more advanced lithography and that is expensive and until recently was not even an option for a hobbyist (without taking a mortgage on their house).
Given current stagnation, you need only wait about 10 years for that viable option.
That is just the gateway drug to bootstrapping.
Check out https://github.com/fosslinux/live-bootstrap
if you want the real hard stuff.