Dan Jones wrote:
I think the airplane is the design. If you built a P-51 entirely from scratch but true to it's design engineering I wouldn't consider it a replica, I would consider it "a P-51", just not an original, North American built one. Sir Thomas Sopwith saw a replica Sopwith Camel once, built exactly to the plans, original engine, etc and said "This is a Sopwith Camel". He even issued it a serial number. The airplane is the design, and if it's true to the design then that is what it is. A replica is a 3/4 scale P-40 with an 0-300 in it.
That P.51 scenario might work in the US, but without any original parts or provenance, I'm pretty sure over here the CAA wouldn't consider it a P.51.
It was a Sopwith Triplane that Tommy Sopwith saw that he was so impressed with he deemed it "late production". It's still airworthy with the Shuttleworth Collection I believe.