I guess it depends on what scale this is aiming for. My idea was for a ridiculously impractical contraption trying to put an actual battleship turret on a land-mobile platform. (Seriously, what was the guy who thought up "Ratte" smoking?)
I must say, though, that if that thing in the picture is to be a 1/144 twin-barrelled King Tiger, then it works
really well
(disregarding the impracticalities of twin main gun layouts for a moment).