The replica MkIX Spitfire is built around a real Spitfire cockpit and Rolls Royce Merlin engine.RAF Harrowbeer was a WWII Fighter Station that was built on land at Yelverton. It opened on the 15th August 1941 and was closed for the first time on 31st July 1945. It was then reopened and remained in RAF Use until the late 50s.