I distrust writeups like this that don't mention other, similar work. Alpine Linux diskless mode comes to mind[0].
0 - https://wiki.alpinelinux.org/wiki/Installation#Diskless_Mode
0 - https://wiki.alpinelinux.org/wiki/Installation#Diskless_Mode
http://tinycorelinux.net/welcome.html
http://tinycorelinux.net/intro.html