Hi,
That's a nice generator, you've got me chompin' at the bit to get mine up in the air. I have a ten-11footer/24 volt mill.... groan, as soon as I can get that tower finished! It looks like you mounted your hub on the back of the rotor, I did the exact same thing. I didnt have to drill the clerance hole for the hub that way...I just hope it doesnt change its performance etc etc.
All the best,
Gavin