All were no less than D60's and the axle shafts were in the 2inch diameter range!But that race is a whole differant ballgame (I plan on being there to crew/spectate within the next few years...I have an open invite)
Like a lot said already though...everything is possible, but you need at least 1 of the following
mechanical/fab skill
or
$$$$cha-ching$$$$$$$$![]()