The only thing I missed was actually footage shot with this system, the very short pan in the beginning of the instructions video doesn't say much. I can easily do that with my camera as well.
I think you should include a video shot when moving around or when walking up the stairs, first without the stabiliser, then with.
I like the idea of having "free" online video's how to build cheap accesoires for your camera, so if there would be more video's added later on and if you stumble across it again, pls let us know.