I agree with Oldman, it would be fun indeed to fly some of the Blue planes against the LW, lots of unknown matchups there. I like Jester's '44 idea too, it should definately have the "what if" of the Graf Zepplin just to throw a twist in, you LW guys are going to have to get carrier qual'd.
I did not put it in my list, but the Spit I would only be available from UK bases, not from any in Norway. They would really only come into play if the Axis got a base in the UK otherwise the range of the Spit I would take it out of the mix, which is what happend in the actual campaign. Basically this would be Hurricanes vs the 109E and 110C.
The Axis could have more than 1 CA, but the Allies should only have CV's, and no CA's in its escort if possible.