Has anyone ever heard of and alternator being mounted off the center section of a 9" rear end and being spun off the yoke?

I saw in a magazine today a Bonniville salt flat car with one. It was kind of cool. Apparently it is not something new as I tried to find a photo to paste on here, I found an old thread from 2006 with them talking about it.
I know that they did not want any drag on the motor, but I would have never thought about doing something like that. Then on the bottom of this car was all sheet metal for no air pockets, including over the rear end itself.
Found a picture:
http://goodies-speedshop.com/images/F3857572 The one in the magazine was slightly different but same concept. Never hear of it.