From Pegasus Hobbies, Museum Miniatures range (I think). Never thought I would get my hands on this silly super tank, but I did.
Assembled (and there are a lot of bits that go together to make the silly bogey arrangements you do not see) and under coated, waiting for that Panzer Yellow dirty wash perhaps (I could justify myself doing Panzer Grey as anything goes in 1945 German paint shops or even a anti-rust primer driven out to the front)?
I cannot think of a valid WWII wargaming reason to have it, but it was a wacky must! It is also huge, as you would expect, next to even an IS-2!
Follow on: A splendid de-motivational poster from the comments below