Heck....Furious the Aircraft Carrier had to have her hull reinforced a couple of times! She was VERY "scantily framed" to try and save weight!
FWIW, I saw ONE photograph with both turrets showing, and several drawings. I suppose it's possible that the photo was something of a cut-and-paste...but what with stability coefficients and what-not....ships generally aren't something you can "kinda" complete!