[Marcello]

OK, let's me get this straight: are the germans going to develop and field FOUR (105/128/150/175mm) tank guns in parallel?
That's a massive waste of effort and a logistical nightmare. If some uber AFV is needed for the propaganda newsreels you can always stick an artillery or naval gun on it. But for actual tanks, TD and Stug you should cut it down to no more than two pieces (you might need something lighter for armored cars and such but I am speaking about guns in this class) at any given time.