If you want step by step instructions, get Hugh Piggotts book How to Build a Wind Turbine, June 2005 edition. It includes plans for a 4', 8', 10', and 12' generators.
At $20 for the book, that makes each set of plans only $5!!!!
Probably the best $20 you will ever spend.
I tried to find out if our hosts have it, but the picture is not the same and the description doesn't say which edition it is. You could email them and ask.
If you happen to be in Ontario, Google says that they have it in the library there.
http://worldcat.org/wcpa/oclc/61202117
For free from our hosts, instructions for a 10 foot
http://www.otherpower.com/turbineplans.html
For free from our hosts, the basics, with explanations and lots of links
http://www.otherpower.com/otherpower_wind.html
Ralph