Author: Yuri Pasholok
This was the initial design of what would enter history as Panzerkampfwagen Maus.
This is the drawing designated KV3881, displaying the VK100.01(P) from 4.6.1942. The tank is still in the 100 ton category, its weight inflation has not yet started. The armor equals roughly to VK7001(K), the gun mounted is the 149mm 15cm KwK L/40. It is generally the German analogue of the KV-5.
At that point however, the process of inflating it has already begun. On 15th of May that year, Hitler has aleady decided that the weight should be increased to 120 tons.