That truck is way over priced I would do this before buying a basket case that I'm not using most of.
http://phoenix.craigslist.org/cph/pts/4474470744.html
http://phoenix.craigslist.org/evl/pts/4500990541.html
or even this and re-frame it
http://flagstaff.craigslist.org/cto/4435031813.html
it has all the body work done it looks like
If you decide to buy pieces get with your DMV and ask how do you document it so they can title it when its done. Ask about a composite car or a home built car.
If you can get a frame and cab with a title all the better. But don't buy a truck at 5 grand just because it has a title and still needs $15k in work