bodyshop cost to shorten longbed?

[Square_78]

Question for you guys...

Since I dont have the tools, nor the shop to do this myself, I am eventually going to have to get a custom shop/body shop to shorten my bed and shorten my frame on my 1970 GMC. Can anyone ballpark what I should expect to pay to have this done? No finished paint or anything. Just shorten, weld, primer and put back together.

How many hours would you say are involved? I am trying to figure out my budget for this winter.

Thanks in advance
Lonnie