Excellant Spitfire Carlos, love it and I can't wait to see the rest
The only thing I would change is the colour of the tyres black, IMHO, just doesn't look right. I use "Tyre Black" (WEMCC C06) by Colourcoats. As you can see it's a dark grey.
My Spitfire Mk 1a undercarriage.

Something you might want to consider when weathering a Spitfire, in the future, (maybe) is the distinctive oil streaks on the undersides.
Again my Spitfire Mk 1a

It looks like my next Spitfire will be a Mk VII (Harri ?) and I'm gearing up to do Johnnie Johnson's Mk IX, hopefully before the end of the year. I also want to get a Mk VIII in the "Grey Nurse" sharks mouth scheme.
and of cours we all know that "you just can't have to many Spitfires"
Again, very nice Carlos.
Mal