these models

wow! you created 37mm AA gun and the 52-k 85mm of the Red Army.. and the 150mm german howitzer
are you planning to add these models in the update sir?

will these be added also? i mean not in multiplayer. but in skirmishes and campaigns

No, because those aren't our models, so we have no longer use for them :-\. We might do new ones if we need them for the campaign, if we work on it later but no promises about it.