Its a P-39D-1 with the 20mm Hispano.
I could see having the nose armament as optional, so you could have a D with the 37mm.
Awesome, even with two versions (D and Q) thats enough for almost all the SEA requirements. If we get more thats gravy.
For info: The P-39D was a 1942 a/c, the P-39Q was a mid 1943 a/c (and used untill 1945), so, there isn't much of a gap.
The VVS P-39Ns, often had the .30 cal wing guns removed, so its very close to a P-39Q in Russian service anyways.
The P-39N would be my 3rd choice, if they model one.