The State of German Anti-Aircraft Tanks

I have the Ostwind II, a German Rank IV SPAA, but was this thing actually historically accurate? After looking into it, there's absolutely ★no★ evidence it existed! In the main game, it was added as a replacement for the removed Kugelblitz, but the Kugelblitz had mock-ups made, and there are photos, blueprints, and even actual prototypes with its armament tested. Yet, the Ostwind II's main guns are depicted as side-by-side, which shouldn't be possible due to its structure... Hey, snail! If you're going to add an SPAA like this, you should have made both the original and this one the Kugelblitz!