Mercedes-Benz actually did that. At the Technoclassica in Essen in 2003 they showed this 280SL that was put together from still available parts (and when bits were missing, from other parts in the parts bin). When I saw the car it first looked familiar, then weird, and finally I found the sign explaining what they did. I did not take a photograph of that sign regrettably.
I sort of think the total value of the parts (not including labour) alone was edging close to EUR 90,000.
In the interior shot you can see it is not original: look at the wood on the doors, and the door panels. The dash wood is also too shiny. I'm sure there'd be other things under the hood, but they did not open it up...
Sorry for the old (and therefore fairly low quality) digital photographs.
Peter