Devil505, you mentioned in another thread you wanted to make sure there were some Soviet P-39Qs available for the October scenario. I've thought about this also. I have several P-39Qs in game and perhaps could help also.
The default skin is a great-looking Airacobra, but I'm not sure what unit its from or where it saw action. I have a couple of VVS P-39Qs in-game; one from 16 GIAP and one from 30 GIAP. Not sure if either saw service in Tali-Ihantala, or if that is a requirement for flying a skin in the scenario. The obvious choice is to adopt Fencer's red-nosed 19 GIAP P-39Q since that is the P-39Q unit listed in the scenario's Order of Battle. Is that what you were planning to do?
There is also an intriguing P-39Q that has been restored and is on display at the Aviation Museum of Central Finland in Tikkakosk. Here's a link:
https://lend-lease.net/gallery-en/p-39q-airacobra-from-tikkakoski-museum-finland/This aircraft belonged to 103 GIAP and ran out of fuel and crashed, in the scenario area, just before the time frame of the scenario. So it's unit was there for the battle.
Bell had its own unique font for the tail serial numbers, different from the stenciled font used by the AAF. I can't recall where I got this example but this it - seems like kind of a "mod"/ fat, rounded look for the 1940s:
Lemme know if there's anyway I can help.
EDIT: Are you aware of any differences between the templates of the P-39D and P-39Q? As far as I can tell, during development, the engine was upgraded and propeller changed, wing armament changed along with some fuel tank and armor plate changes - but I don't know of anything that would impact the panel lines or rivet detail between the "D" and "Q" types of the P-39...