Yeah, this boat definitely qualifies as "blue sky" to say the least... makes you wonder though, given the nature of escalation back then, what the allied response would be if one of those things was actually launched...
P.S. these are the kind of thoughts that kept me out of the really good schools.
Patton's Response: "Drive straight to Berlin! Because after building that they can't have any steel left to build any more tanks!"
Zhukov's Response: Same as Patton's
PS: Yes, also saw a gustav shell at the Aberdeen Ordnance Museum. Makes me wonder what the rate of fire (hah!) for an H-45 would be. Broadsides per hour?