Lake Flyer, as Paul indicates, it would not be impossible to make the Taylor MkVIII into a Seafire XV. I would get a set of Platt's MkXII plans and shrink them a bit to get the nose contours for building the Griffon cowl. I know the MkXII retained the assymetrical oil cooler/radiator of the MkV but I think the Seafire XV used the symetrical units per the MkXIV Spit (I'm not sure of that though). Also, as Paul indicated above, the Seafire may have used the broad chord rudder and possibly even a different vertical stab entirely. There again, I'm not sure as I have not researched the Seafire XV very much.