I posted in your other thread, but I will repeat it here because it is very important:
Make sure you can get a title before you get too deep into this project. Especially if it was actually a forest service truck, it might not have been the older gentleman's to sell (legally speaking).
I have seen too many people take an old beater, fix them up real nice, then lose them when they try to get a title because they turned out to be stolen.