Duff, welcome to the forum, I think I might have some insight on this, having learned from the school of hard knock, where they don't give grades, just invoices and bills. While my truck is't as big as yours it is a bit more compact which causes more problems then building big.
Big is easy, it is way easier to run lines and hook up plumbing when you can reach it sitting in the storage boxes rather than tight spots like mine. Chuck at C & S has a truck almost your size maybe a bit bigger that is at the stage you could finish the interior yourself, he wanted 50K for it which would be a real steal.
My bill list that I posted did not include a s&^tload of labor. Buying an incomplete truck would save you a fortune.
-blzz
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2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio
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