Check out Carter Auto Restyling - Youtube. He does a perfect chop on Chev or GMC AD truck in three of his videos. https://www.youtube.com/c/CarterAutoRestyling/videos
If you feel you can complete the welding and do the finish work as you mentioned in your initial post; there should be no reason you couldn't study it a bit and do the whole job.
AD truck, with its inner structure chopped finished in metal no body work or paint. 160-200 hours. Im 85 and hour + 20% on material. and about a 150-200 shop supply fee. it would 100% be a T&M job, but suspect 18500 for a 2.5-3.0 chop
Practice hammer welding. I learned [ with a torch ] building cut down Wisconsin modifieds. Got real good at it. Even hammer welded in the roof insert.---- The Chevy PU. Welded in a 2" strip across the roof and a strip down the middle. Welded up the seam above the windshield. All metal finished. . Now using T I G.---- Fibergl*** Willys. I new Ohio George chopped his 33 4". I had the copy shop copy a magazine picture to scale. With a scirrors I chopped the top 5.5" in back and 5" in front and knew the other cuts I had to make. I layed the W/S back.
I wanted something like this. In the end I left it unchopped And spent the money on a little fun hotrod.
Not the old Chevy, I don’t think he chopped that one not sure what the brand was, it had a funky rad shell
Up to 52 , all Mopars were flat gl*** except except after 48 had curved back window..Flat gl*** is still reasonable , the gasket rubber cost has kinda gone up a bit...Its true as far as getting the gl*** cut and installed is a challenge as the skill set to do it has not kept up...