Here's a zip file containing all the skins I've created to date:
C:\Program Files (x86)\1C Game Studios\IL-2 Sturmovik Battle of Stalingrad\data\graphics
Some of the newer ones I haven't done screenshots for since I think it takes away from time actually making skins.
All skins are 2k... I resized the 4k ones to reduce space taken up on player's drives. You can't tell the difference except in close-up screenshots.
I didn't do Hess's skins... I tried but didn't have enough Dropbox space.