I agree that without other photgraphic documentation of the "resurection" we are all just guessing. Knowing the controversy about this, I'd be willing to bet that is exactly why they involved Galen from the begining.
So would the 50% be visable sheet metal or structural sheet metal?
I'm willing to bet there are a number of more "average" cars on this site that have had inner and outer fenders, doors, quarters, dutchman, and taillight panels replaced. That is easily 50%+ of the visable metal. Yet, I bet they still have their vins and title work and call themselves JS23 or BS23.
What about those race cars that have had sub frames replaced with tube frames with the floors replaced with aluminum, inner fenders removed, fiberglass doors and fenders and huge wheel tubs. Over 50% of the supporting structural metal has been replaced with something else. Granted, selling untitle or salvaged race cars is not the touchy proposition that it is with a street car.
I'm just saying this isn't all as cut and dried as many would like to think and there is no legal definition that I'm aware of that the defines the limits of rebody. It is all personal opinion. Heck, there aren't even consistent titling requirements from state to state in regard to old cars. I think Challenger HK nailed it when he said lawmakers, being predominatly non-car types, never envisioned this amount of effort in rebuilding a vehicle so they stopped at simply saying swapping vins onto another completed body is illegal. That leaves the rebuilding process completly wide open.