Here is something to ponder, had the Panther, Tiger and King Tiger being converted to basic weight of materials and converted to the 25,000 kilos per Panzer Mk IV the Germans could have produced a further 11,500 Panzer Mk IV's for the battlefields, giving a total strength of 20,000 Panzer Mk IV, this is with the 20,000 or so other models running around. Imagine the German Panzer force with 40,000 panzers on their books.

Before anyone finds faults with my numbers this is in theory though, and theory and the real world don't exist.