P 1000 turret ended up at coastal defence battery (Batterie Oerlander) near Trondheim, Norway.
In December of 1942, Krupp created new design of 1500 ton tank - P 1500. It frontal armor would be 250mm thick and it would be armed with 800mm super heavy mortar “Dora” type and possibly two 150mm artillery pieces. P 1500 would be powered by two or four submarine diesel engines. In early 1943, Albert Speer cancelled both projects.
Quoted from achtungpanzer.