Again, thanks. I was thinking of a different direction. From what I saw and caught my interest I thought first of a smaller and somewhat simplified version of the Spitfire, for export or license building. This would be similar in concept to the Curtiss CW-21 and 75H, North American's P-64, and Vultee's P-66.
From what I understand, the Spitfire's was an aerodynamic work of art, but difficult to make and therefore expensive. When the 300 was first built in 1936, it was assumed that a war was coming, but no one knew when, or was sure who was going to be fighting, and on what side. Also, no one imagined the length or scope of the war. The Spitfire wing was was adequate for batches of 100 or so. However, when when the war began and grew, it was suddenly as many as airplanes as you can make, as fast as you can make them. This is why supermarine began looking for a simpler wing. So, that's my idea, a cheaper alternative to the Spit, developed in parallel. I still may do it.
However, why the Buzzard engine? This was developed in the 20s, and didn't get much interest even then.