Originally Posted by G Connor

And they died in large numbers at Kursk and Normandy and the Ardennes when they attempted to operate without air superiority.

As for the nominal AA weapons you cited, think about trying to track an aircraft attacking from the rear with a closure of 350Kts. 3.5" rockets or the 37mm has a effective range in excess of 2 miles. The 14.7mm has a range of less than half and a rate of fire so slow you can fly between the bullets. This beast, and the Maus died on the drawing board for good reason.