Paul
Here's a link to the catalog of the hub I bought www.wintersperformance.com/catalogs/2005WintersPerformance/0621024.htm
I bought the front kit 3750-F from them come complete with disc brake rotor (for optional uses like a manual shut down brake) for $165 plus shipping. The only draw back is the need for a custom made mounting shaft if you don't want to buy a axle tube.
These are designed for Dirt Modifieds that we drive up here in the northeast and I know they can take a beating on the race track now to see how they do in the air not attached to a car.
My idea is to build a small 8" alternator and attach the stator to the custom made spindle that I will get made. The wheel stud bolt circle is 10.25" so I should have plenty of room for the spacer between the magnet plates. The blades and support plates will be bolted onto the studs first. I will have to buy the longer studs.
I am designing this to be a 5 blade 8'-10' mill.