That B-17 still exists... kinda.
It was at the New England Air Museum for years, but when they got hit by a tornado in the 80's it got lopped in half by a falling roof beam just aft of the wing. The plane then went down to Reilly Aviation in Kissimmee FL to be restored. This is about a decade ago now. I'm not sure her current whereabouts, but I know she was slated to be restored to B-17G standard.
Cool photo though. Nice job photoshopping out the 4 Wrights. The cool thing about the real photo is that the 4 radials ARE SHUT DOWN! That Turboprop was the only thing powering the airplane. Pretty impressive!
As for my favorite B-17 variant, I'd have to go with the YB-40. There's just something cool about the "escort battleship" concept.