So this is a wrapper to install+launch a VirtualBox Ubuntu VM to use Gitian in LXC mode? Sounds good!

Exactly. Just codifies what it took to get it running in a VM.

Hopefully by Monday I will have tagged TBB 3.0a2, and we will begin building it. If your build matches (or comes close), I will merge this stuff for 3.0a3.

Note that I am about to commit some changes to mkbundle-*.sh, so be sure to rebase your github branch for your build (which you will also need to do anyways to pick up the latest 'versions' file tags).

Ok. I'll keep my eye out for 3.0a2