If you decide to do a frame off restoration do as he says. He just looks... never mind. Only to border guards...
BUT, in your case I would do a running restoration. Never do more to the truck that you can't get it back together and use it, drive it, move it.
If you take it all apart there is a very good chance you will not put it back together. Not in 400 hours, more like 4,000 hours.
