What a nightmare that poor guy had!
I've built a few classics from scratch, starting with very little and it's a long and tiresome process to get them registered. You have to keep immaculate records of all purchases and have them available for the state inspector(s). My current pleasure driver is a '79 F-150 shorty 4X4 that was assembled over 16 years out of wrecking yards and parts houses. I started with a frame (from a rollover) and it has the VIN stamped in various places. Had that inspected and verified first. I was also able to salvage the bottom half of the driver's door with the tag affixed (there is no VIN tag by the windshield on these trucks) and the cab tag under the hood which is held on to the firewall by a single phillips screw from the factory. I went through 3 or 4 different inspectors in that time, but was finally able to get a clean unbranded classic title, no small feat where I live. The "key" was documentation, documentation, and more documentation. Yes, it would have been easier to just buy a clean example and restore it, but where's the fun in that? And this pickup is definitely one of a kind, built just exactly the way I want it, and really fun to drive.