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The rudder and ventral fin look right. An only note , there was a thin gap between the rudder bottom edge and the ventral fin top one. But it was quite thin and actually might be unnoticeable.
Great work Charles!
Looks like your upper wing roundels may have over-large red centres (and lowers should be Blue/ White/ Red).
What's the outer diameter? Maybe I or someone else has correct ones for you.
Wow Charles you're moving along swiftly now and what a magnificent looking machine it's going to be.
Sadly am unable to help with the decals as you're a 1/24 scale which is way out of my model range. I'd be scouring the net to see what comes up.