:oDid not know it, tell us more about it!
Please note that this is a totally fictitious interpretation of a rather sketchy tank concept (no concept, no plans/blueprints, no hard and fast facts; in fact, even less than for the Panzer IX and X, for which there are at least concept artworks, although those were in all probability a propaganda stunt). I have only seen it crop up on the internet, and I cannot remember any of the more reputable scientific researchers on the topic (Spielberger, Doyle, Trojca, maybe Restayn, too) ever comment on this.
I am dubious, however, that this would have passed Heereswaffenamt scrutiny. Given that the planning was pretty fixed on the E-series, I won´t dwell on the actual feasibility of the project.