I've built one of these and, like you say, a nice kit. It does have some issues though, some of which I can see that you have addressed, like the tail planes. There are IIRC a couple of clear parts that fit into the fuselage, near the forward cockpit (or they might be on the Revell MkII?, add them sand flat and paint over them. Again there are a pair of clear parts that fit under the wings, leave them off! They bare no resemblance to anything on a Spitfire!
I'm not sure of when your choice of subject was built but It probably had an internal armoured wind screen, the kit one depicts the external wind screen. Also the shape is a bit wrong, but I'm interested in whether you have found a replacement canopy? Incidentally for my MkV I simply left off the armoured screen part, then found a photo showing that my choice had the external screen!
Also you may find that the side cowling panels a bit short, I simply added plastic strip at the rear to extend them slightly. Again I'm not 100% sure but it may have just been one side that was effected.
I am very pleased to see that you have gone with paint masks for the main markings
But decals for the codes and serials! that cannot be allowed
Contact me and I will produce them for you
You just can't have too many Spitfires