ZSU didn't come into production until March 1945, and by then the Luftwaffe was pretty much grounded. As for a reward, I doubt it... we have so many other things to do right now especially since CoH2 is going to be out early next year and we need to get the Ostheer out asap. I doubt I'll even get all the Soviet models finished before CoH2 is released, there's only me making and skinning models on the team right now.
And yes, T-60 was used for Anti-Air on occasion, like in this image...
20mm guns are generally Anti Air in game, same as the Sdkfz.222 and the Sdkfz.234.