One interesting thing I noticed is that this project ALSO doesn't seem to have a controller. You can't really play SteamVR games without at least one! (Issue #50)

You can grab a Samsung VR for very cheap, put a phone on it and do VirtualDesktop magic, but you are still gonna struggle without controllers. Same for Google Cardboard and other similar projects.

There's some very cheap controllers you can get, with base stations for tracking like the Nolo-Home, but they are still quite behind the tracking precision and latency of some "top-of-the-shelf" headsets.

It's an interesting idea and I hope the developments on it go forward, specially since the recent Facebook/Oculus announcement.