After installing [layman], Just add the overlay via
layman -o https://bitbucket.org/ArneBab/neo-layout-overlay/raw/tip/overlays.xml -a neo
Then you can directly emerge [packages from the overlay](http://bitbucket.org/ArneBab/neo-layout-overlay/src).
These ebuilds worked for me *when I added them* (or I would have removed them). They might eat your disk or fry your fridge.
You’ve been warned :)