I forgot about 9MB footprint after the first boot in CRUX, with my custom kernel
supporting everything that I need (pretty much the same kernel I am using
now, except for now it is 3.18.25, then it was 3.18.20).

Here in Devuan I have 19MB but with services on startup (dbus, acpid etc.)

And CRUX also uses eudev and BSD init.