well what a intresting read!
well the reason there a little heavery is due to the chassie its self its 3 times the size of a saff, also the rear body weighs lots, but replace most of the rear body of the p100 for fiberglss fit a cossie lump and say bye to all them saff`s.
as for a rear axel you use one off a capri. theres lots about that are also splippers
(lsd)
hope this helps any more info email me.
kickingriffin@aol.com