considering the other book on that site and the fact i cant find any colloborating evidence for such a project even with having over 500 books on WW2. I can conclude that its a work of fiction.. or at the very best something that was never even drafted in terms of modeling the feasibility of such a tank. Only the Maus seems at least something that was attempted (* they have 2 of these tanks unfinished). I feel that the maus would have been defending Berlin if Hitler lasted a few more months. But as you know in trials the Maus wasnt able to meet the speed requirements as per the specifications.. the germans were working on a solution when work was halted for more important considerations.
I never took it as even a possibility for deployment, but I wouldn't put it past the Germans to dream something like this. Either way, interesting that someone put that much thought into it.
The Maus was another thing I was going to mention, but couldn't recall it's actual name.
Didn't the Russians have some sort of land rover tank? Multiple turrets, quite large? I remember seeing something a long time ago...