Living here in the States I always find the discussions about the DVLA and MOT rather interesting. For the most part, and each State is different, we don't have to jump through as many hoops as all y'all do. I bought Grover from a person in another State and had him shipped to me. Because it came from out of State it had to be inspected; they verified the chassis number (that's a whole 'nother story), made sure the headlights, brake lights and blinkers worked and made sure the brakes worked - that was all.
Seeings how vehicles tend to be inspected quite extensively over there, how was the chassis issue not discovered at some point along the way BEFORE the guy bought it? Wouldn't it of needed to pass a MOT inspection at some point while the seller owned it and the chassis of raised a red flag? Or can the MOT people pick-n-choose what they think is an issue?
As to a 'hurting back' I get it. SWMBO has back issues when riding in rough conditions; with that in mind I switched Grover from leaf springs to parabolics, she hasn't had an issue since.
As to the "...why go through all that effort, at that point, just buy a 90/110..." - fully agree. I have a good friend who really, really wants an old Series Rover, preferably an early IIa or older. Then he tells me what it 'must have' - such things as AC, stereo, and so on. I don't remember everything that was on his list, but it was ridiculous. I told him "why bother, just buy a Defender or Disco". He said "why? can't I just add all of that?". I told him he could add some of those items, but it will cost a lot and ruin the rig. In a round about way he admitted he wants all the creature comforts of of a modern rig, but wants the 'look' and 'coolness' aspects of an original.