Thanks for the links Guilherme; it's really interesting because that's exactly the sort of thing I was looking for.
I don't know of where we might have CVMFS mounted, because I don't work with the HEP/ROOT community, but it might be somewhere. I take it that it's just a FUSE implementation that I could mount on my own machine? That said, if I am unable to get CVMFS working (it doesn't look like it will be trouble), do you have a git repo of your ebuilds that I could take a look at? I'm curious about the ebuilds that you're using in the environment.
