Hi!
Well, i think the main problem is not only the 3-d-model ant paintjob. There is much more to do to tweak the FM right. These two things at first have nothing to do w each other - so u could take the model of a sheep and combine it with the p51-FM so it would be a rather fast sheep.
And concerning the FM - its not enough to just add more power. The enginges have differences in weight, as has the armament. So u mainly have to do a more or less new FM, because all these things interact with the shape of the earlier AC. More Weihgt, sam Wing-surface - higher weight/cm^2 and stuff.
And then u have to find believable sources to find out how this thing really was to fly. That will be a problem for any rare type especially. And I suppose for people like Pyro and a big part of this community it is not enought to estimate how it could have been but read at least 2 or 3 different test-flight-reports on how this thing really handeled.
After all - i dont think it is much easier to do a variant of an existing plane than a completely new plane. And U should consider: when u do a variant - u already have a more or less similar AC in the Arena - it must be somehow different to the existing one but still be somehow the same...
OK, enough for now. But I think it is a good idea to add a few earlier planes.
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CU
Purzel
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"Find the enemy and shoot him down, everything else is nonsense!"
M. von Richthofen