I find these stories all a little odd, in the sense that, looking at the wreck
they begin with, one rather suspects that there is hardly a scrap of the
original material in the "restoration", and that the process is rather more
like a creation of an exact replica, with tatters of the original sitting about
in the shop to provide inspiration. I wonder if this has something to do
with registration of aircraft, that there is some sort of bureaucratic benefit
to claiming a continuation of a previously existing flightworthy unit rather
than having to register a new one. This is not the most extreme example
of this I've seen, the one local to my region,
http://www.y2kspitfire.com ,
is a far more extensive reconstitution, but it does seem to be a general
practice. At some point, I expect to see a "restoration" conducted of an
aircraft whose extraction from the crash site yields 3 kgs of oxidized sheet
metal.