In 1912, the outfitting plans (joiners) have 28 staterooms, on 2nd deck.  The staterooms on 2nd deck were for the Wardroom Officers.

The drawing below shows frames 1 - 12.  It is a GIF of an AutoCAD redraw that I made of the joiner.  The joiner plans was found on microfilm by Tom Scott.  He printed and scanned the joiners.  When the microfilm was created (late 1940s - early 1950s), the clarity of the text was poor and many small objects could not be differentiated with other close objects

The three red objects below are the locations of the chain chutes.  Must have been a heck of a racket when the anchors were dropped