On the Sturmovik Commander official page, we have published instructions for converting WWII airplanes to the game reality.

These may be used to add missing aircraft to the game, to build new squadron lists, or even to construct alternate history airplanes (if players wish to use them). Well-done plane rules or squadron lists will be added to the official rulepack.
This article is the next step in making Sturmovik Commander the free, community-driven ruleset that it is intended to be.