Open Stack

I noticed that Grizzly-2 is in 13.04.  I'd like to run them in 12.10 and not update the entire OS.

What's the best and/or easiest way of doing this?

1) Get the source packages and build them in a PPA?  If so, what is the complete list of source packages and build order to do this correctly?

2) Temporarily update sources.list to use raring, upgrade or install any packages with 2012 in the version number.

With either approach, are there new dependencies upon non-OpenStack packages that are required?

Thanks,
Blair