Don't see why not, but all the upstart stuff is platform-specific.

I'd suggest you spin up a clean Ubuntu instance in Virtualbox and just run the fab deploy script against that locally... It won't be fast, it won't be pretty, but I'm pretty sure it will work.

I've installed my instance on FreeBSD, i'm pretty sure you can install it without issues on an OS X Server. Read the install scripts they give and adapt it for OS X.