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Great project, I'm looking forward the mkIII which seems promising and cheaper :-)
I'm testing a VAWT at the moment with a Nema 23. I was considering making a generator in the near future but you seem to tell it's a waste of time. Some maybe improving the turbine efficiency is the way to go.

Did you consider adding vortex generators (can lead to 1.5 to 3% improved efficiency) ? http://www.windpowerengineering.com/business-news-projects/vortex-generators-boost-wind-turbine-performance-aep/
It could be glued on the the blades or integrated in the 3D model ?