It has been decades since I've looked at this closely but my recollection is some lower body parts from 72-73 interchange onto 69-71 with only minor mods. The one thing mentioned in the video which I learned doing my Polara back in the early 2000s was do as much of the panel replacement/repair...
Thanks for posting. Nice to see one of the land yachts getting some well deserved attention. While the music not my cup of tea its still better than the Swift or Carpenter pablum.
Your assessment that its a flying rock is on the money. In fact all the hype otherwise is just a distraction. Intentional? I'll avoid that rabbit hole here. In any case I've always felt the odds of us being alone in the universe are pretty slim. Its always nice when someone way smarter than me...