With these NS37s you really don't need the Stuka's BK guns. Oh sure the BK guns are much more powerful, but with these you could land 20 rounds on target in the same period of time it would take you to mis with 4 rounds on the BK. Belt fed, high rate of fire (relatively speaking) and did noticably more damage than the 23mm guns our current Il2 has.
That's a very promising guns package!
That means, however, we've got the late-war IL2 model and it really won't be suitable to use in earlier scenario/SEA setups because of these guns.