In an effort clear up some confusion I added some documentation to the Crouton Wiki about installing Kali via Crouton, and how to get the tools.
https://github.com/dnschneid/crouton/wiki/Kali
For more info, also see my previous blog post.
http://puttingthingswheretheydontbelong.blogspot.com/2014/01/install-kali-on-chromebook-using-crouton.html