Well, it lacks a proper bootstrap and its documentation is basically empty trash.

hell live bootstrap has those and did it without requiring a file system or a kernel to get there https://github.com/fosslinux/live-bootstrap

Warzone 2100 (you can download for free as it is an old PC game that went GPL)

gets more on the nose by the day

That is just the gateway drug to bootstrapping.

Check out https://github.com/fosslinux/live-bootstrap

if you want the real hard stuff.

Really looking forward to seeing this packaged in Guix