Tankcarl,
AFAIK, the Flakvierling emptied it's empty cartridges on the front, in a box., each gun had it's own magazine, and as the fired in a diagonal fashion, it gave the loaders time to put on a fresh magazine.
Just something that feels odd, is seeing the vehicle in three-tone "summer" camouflage, and seeing the soldiers in mid-winter-gear.
For the rest of it, superb work, and I hope my first paintwork will be just as good...