As we prepared for going out into the field the first thing we did was build a few demos with different scale ratios. We wanted to get a feel for the physical and visual space in both the real world and the tango. For the models we wanted to keep things as raw as possible, basic lights, base geometries etc. The idea is to really to run prototype after prototype and see how the hardware and software hold up. In our experience, each new sdk update has had its ups and downs so we find ourselves learning with each build.
For more information visit: http://www.passion47.com/unity-3d/project-tango-field-test-1-adjust-scale/