S&N "quoted" me (ruff figure, don't hold me or them to it) of $12-$15K for a "roller" with me providing the raw drivetrain. That was axles, engine/tranny/t-case.
They would give me back a rolling chassis with tube work, shocks/struts whatever, links, motor and tranny mounted, seats mounted (if I provided). Sounded like a lot till I thought about all the little things and butt loads of time I would have had to put into a $3K "basic chassis" to get it to the same point.
It would still need things like Steering, petals and mount, skins, detail, electrical, exhaust etc....
I use those $$ amounts as a bench mark when I'm looking at things I find in the classifieds etc.
You could probably build a decent truggy for 5K with doing almost all your own work (not counting tool purchases), but its all the little things that kill ($100 in bushings here, $200 in bolts there, $500 in misc steel for brackets as such, lost money for having to do it again......
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Anal mature