I have sucessfully installed funtoo on my chromebook using crouton. All I had to do was extract the stage3, copy the /etc/crouton/ files from another ubuntu chroot and then manually create a user with uid 1000. I can enter-chroot into funtoo and emerge and quite happy with this. In fact to compile faster I then decided to install another funtoo on my fedora laptop to run distcc with the same gcc. Awesome!
ok the only difficulty I have in both environments is with starting services with the standard funtoo init scripts. For example I want to run distcc and sshd (on another port