Noah - I back tracked a few pages to look at your sprue shots for the float spit. From what I can see, the wing tips look normal, no need for surgery. Also, since the underside have identical size rads, this makes it a Mk.IX . I think the supplied decals are from a regular kit, as photos don't show any squadron codes, but only regular markings (roundels and fin flash), yellow P for the prototype models and those 3 sent to Egypt had their own fuselage serials.
From what I've read briefly on the net, all told 5 Spitfires were converted... one Mk.1, three Mk,V and one Mk.IX:
Mk.1 - intended for the fjords in Norway, but the German campaign ended quickly so further interest dropped in the project.
Mk.V - three of these were converted and arrived in Egypt. Plans were to have them operated from tiny islands along the Greek coastline to attack German transports. A few weeks before this operation was to be implemented, it was learned the Luftwaffe had reinforced the area so the floatplanes were moth-balled.
Mk.IX - intended for the Pacific, the pace of the war never realized the potential of this one, and it too joined the others in the storage shed.
regards,
Jack