I know of two people that have used this setup:
Ron Pasdernick
http://www.firstclass.com/~ron/locost/index.html
http://www.firstclass.com/~ron/locost/reartop.jpg
and
Rob
http://www.mindspring.com/~robmk2/

any one else? I trying to get a better idea on how to mount the diff and wishbone measurements if possible.

thanks
-Jess
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[Edited on 1/28/2007 by jestre]

looks quite a hefty unit - any one know how much it weighs?

I believe its actually lighter than the live axle. that and much less unsprung weight.