Sorry, did the omission of a very detailed list of todos imply I don’t know what this would entail?
You’d need to reimplement a variety of layers and could leave out of a lot too.
Personally a rudimentary BIOS type system in hardware that can read/write to an OS layer would be the design I’d start with
The OS doesn’t need userland tooling then
But no one cares about the OS that powers everything being an archaic mess. Gotta fetishize where the profit is