There ought to be at least one Dora FW190 that's flyable (or could be made so) out there. It was at Georgia Tech in the early '60s and sold to a fellow I knew. He turned it pretty quickly for the princely sum of US$40,000...!!! He only made about tenfold, but anymore?
Engines are pretty scarce.
I wonder if they still run up the Ki100's engine at the IWM any more.