Dr. Porsche was an important figure in terms of German armored fighting vehicle development during WWII. Unfortunately, not all his ideas met with success, with the VK4501(P) being a prime example. After its failure, he nevertheless designed an updated version known as the VK.45.02(P). He actually proposed five different versions, with four different types of engine and both forward- and rear-mounted turrets. The heavy tank turret was designed by Krupp to mount an 8.8cm KwK43 L/71 gun, and it featured a rounded front for better ballistic qualities. Production of the VK.45.02(P) was authorized in April 1942 and 200 vehicles were to be produced. Again, however, Dr. Porsche was stymied by a too ambitious automotive design, as the tank's 10-cylinder engine was unproven and complicated. In November 1942 the whole contract was rescinded and the 57-ton VK.45.02(P) was consigned to the fate of being just another 'paper panzer'!