The script is great. Just one tiny issues - it doesn't install nfsclient by default which means you have to install it yourself afterwards to setup a NFS shared folder in the Vagrantfile - eg the following won't work until you've manually have run "sudo apt-get install nfsclient" in the VM:
config.vm.share_folder "v-src", "/vagrant_src", "~/src", :nfs => true
that should be fixable..
Add NFS to fix #3