The model is done by Bill Holker and dates back to 2008 already. Its a sort of unfinished project and Bill also left the source files for anybody who is willing and capable to improve the model. Henry William did some alternative textures for the CFS2 converted version, which are available here in the library (just do a search on Guardian and they will pop-up).
The real aircraft was an interesting thing. The performance of the Gloster with the less powerful Bristol Mercury engine was similar to the performance of a Hurricane, so the aircraft definitely had potential. It was an all metal aircraft so less easy to produce and needed a lot a of materials which weren't really widely available. But perhaps the more important reason not to continue with the F5/34 was the lack of suitable engines. It seems the production of the V12 water-cooled engines was reserved for fighters in the early years of the war and radial engines were reserved for the multi-engined aircraft like the bombers.
Concerning the link with the A6M Zero; The Americans claim the Zero was based on the Vought V-141, an unsuccessful prototype which was sold the Japanese in 1937. However the Zero looks very much like the Gloster and had nearly the same dimensions. But as the fuselage shape was more or less dictated by the fact a radial engine was used, it isn't very surprising the shape was very similar. The available power from the engine can be linked to the dimensions. So it could also be be coincidence.
As I now have a decent paintkit for the model I might do some other fictional repaints, but that will be after I have finished my current projects.....
Cheers,
Huub