I have several books on Lend Lease VVS fighters, there were P-40Es in 1942, there were Hurricane IIs of various types 1941-2, some were converted with the 23mm and 12.7mm, some were IICs, some were IIBs. They were not just flown by the RAF 151 Wing. The Finns reported fighting them in the Leningrad region.
The P-39 version was not just the Q version. They received the Airacobra I (ex RAF), P-39D-1, D-2, P-39L/N/Q from 1942-44.
There was no AP ammo for the 37mm gun in any version of the P-39 in WW2.
That being said the region and the timeline planeset is stretched somewhat to fit the event. The biggest problem was pitting the I-16 vs an axis plane set. We cant do Russia mid 1941, because there are no Lend Lease ac present at all, which just leaves the I-16 and the IL-2. So the date has to be moved up. The map is a generic map of the Eastern Front, not an exacting duplication of an area. When we get Karelia up again, we can have a more precise region hopefully. Its representing the Nothern area mostly to include the Finns and the B-239 in the set, since thats the only area the Finns operated.
Strictly speaking, the plane set is authentic, but the ratios had to be adjusted to make it workable. So we have P-40/P-39/Hurricane vs 109F/B-239/110 as they "good" fighters, and the 109E and the I-16 as the "baseline" fighters. With the 109E as the better of the two.