Here is a simple tutorial showing how easy it is to integrate the Project Tango SDK into the VR SDK. This allows for future android phones with motion tracking enabled to take advantage of motion tracked VR for immersion while still being able to load up the normal cardboard profiles. This also puts it into one app, so if you do not have a motion tracked enabled phone, you can still run cardboard.
The basic concept of this tutorial is simple, the first step is to Integrate tango and cardboard sdk's and then trigger a method adds the project tango scripts and components if the tango connects to the service.
Let me know if this was helpful, super happy to work on doing more tutorials for the tango and/or VR platforms in unity.
At 3:35 there is a brief pause in clarity where I open the Tango Application script and briefly mention I need to call a static bool over on the tango connect method, but I forgot to add it into the GVRtead script so I add it in then without talking about it. I then call it later.
Super excited for the tango motion tracking support to be native in Android n, allowing any phone with a wide angle camera and enough compute to use motion tracking. The future is rad!