There are more P-51s flying today than there were 25 or 30 years ago. Like Elwyn mentioned, with today's technology and manufacturing methods, you just have to "want to do it" more or less to get something done, and that just depends on the depth of your pockets. Remember the Red Baron RB-51 Reno Unlimited racer that crashed years ago? The whole air frame was pretty much written off but then again there wasn't much of the original airframe left at that time anyway. It was a pure miracle that Steve Hinton survived that crash. That airplane "exists" today as a pretty much stock TF-51 (I think, modified with dual controls) and they just started with the name plate and the control stick. There are teams down under in Australia or New Zealand that are building new Mosquito bombers and I don't think a lot of people would have ever thought that would ever happen again. There will always be the argument that these airplane belong in museums on static display only to preserve them, and the other side of the argument that they were meant to fly and are best presented as such, and I am a "keep 'em flying!" kind of guy!
Type at you later,
Dan McEntee
PS to add:
The "109" correct designation is Hasa 1112, I do believe and were made under contract in Spain, and were surplus from the Spanish Air Force and purchased to make the movie, along with a Hasa version of a twin engine bomber (Heinkel?) and a JU-52 also. I think those airplanes survive today also. The movie "Battle of Britain" also brought Dave Platt to the fore front as a top modeler as he did most or all of the model work for the movie.