You'll likely be paying for a lot of frustration and "ugly work" that is common when disassembling these trucks, frozen bolts, etc. If he's doing re-assembly then he'll want all new hardware/rubber on the bed, glass, and such, so your costs will include that stuff. That kind of work is much more in the "restoration shop" scope of work than a paint and body shop trying to push jobs through the shop as fast as possible. You're easily in the $10k+ range IMO.