The Seafire XV, which is the version used by the Canadians and seen in the first and last of the above photos, is essentially a navalised MkXII Spitfire. The MkXII was the first production version of the Spit to use the Griffon engine and was a very limited production airplane. Despite that, Dave Platt saw fit to build a MkXII and his 1/5 scale plans/short kit are for that particular Mark so it would be a great place to start if you wanted to build a Seafire XV. You could also take the same basic airframe and stick a bubble canopy on it to make a Seafire XVII (which is the one I'd like to do).