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There are a lot of alternative P-51D skins available for CFS2 but I don't see much for CFS3. IL2 skins layout does not offer any big advantage over the CFS2 layouts that I can see, either. It's the graphic compression algorithm that determines how sharp the skin details appear, not the model. We can use a less "lossy" algorithm (extended 16 bit or extended 32 bit) for CFS2 planes but it affects the frame rates in play. Finally, the detail in the finished skin is almost 100% up to the painter in all cases no matter what sim the model is in. See the above pics of the CFS2 Alphasim P-51D or the Rebuffat Bf109 - how much more could you get from IL2 or CFS3?
IMHO I still think your time would be best spent working on adding LODs to improve the Alphasim models rather than re-inventing the wheel. Just my 2 cents.