Yeah, so you need to know what you're doing to run nightly builds atm - at some point we might sort ourselves out and get the documentation updated and make the data easier to work with.
For now, if you really want the nightly build, you need to download the data - the mac builds I provide contain no data at all. If you understand subversion, check out
https://vdrift.svn.sourceforge.net/svnro...drift-data otherwise go to
http://vdrift.svn.sourceforge.net/viewvc...rift-data/ and click Download GNU tarball near the bottom (be warned, this is something like 1.8GB). You then need to have a file structure somthing like
some/folder/VDrift.app
the/same/folder/data/
where data/ contains cars/, shaders/ etc.
I have to go now, will be back at some point tomorrow.