In the late 70's, the aging, five boats each of the George Washington and Ethan Allen class were patrolling and refitting out of Guam.  I was assigned to one of them and made the last three patrols of her career. 

Regarding (any) submarine model with a cutaway view:  The only relatively flat areas are the decks.  There are no flat bulkheads or flat areas on the interior of the pressure hull.  Every flat space to mount something is occupied.  The interior of the pressure hull (the "walls" and "ceilings" of a submarine are covered with piping and electrical cabling.  False ceilings cover many of the smaller areas where the crew eats, sleeps and stands watch, but no spare space is wasted.

Just about everything inside, (bulkheads, pipe lagging, pressure hull insulation, and cableways) is painted either seafoam green or a light tan. (Missile tubes were a light tan on the older boats; Tridents employed a dark shade of red that was closer to the red lead paint  color on the exterior, below the waterline.)

I built the GW class model as a kid, and was pleasantly surprised a few years later to be living aboard one.