Oh, and since you have AT guns on the list, what about the 7.5-5.5 Pak 41 taper bore gun? Production started in 1942, but was limited to 150 guns because of the shortage of the tungsten that the guns relied on. They were insanely powerful, punching through 171mm of armor at 500 yards.
I just wish this would get stickified!
the two most i want to see that could be built on the battlefield are:Panzer 3Tiger 1