FWIW Dept.

Thanks to a new batch of photos of the USS Missouri's message processing center, I think  I have figured out the configurations of Model 40 equipment used in the message processing centers aboard USS Missouri and USS Wisconsin. These two battleships were updated with M40 equipment instead of the M28 equipment used aboard sister ships USS New Jersey and USS Iowa.

AN/SGC-10 - Keyboard + Display + Printer + 2 Mag Tape Cassettes + Controller + Interface

(equivalent to Model 28 ASR)
AN/SGC-11 - Keyboard + 3 printers + Controller + Interfaces

(equivalent to Model 28 "waterfall" printer)

AN/SGC-6 - Keyboard + Printer + Controller + Interface
(equivalent to Model 28 KSR)

Photos are at

and

here's a sample -

Any additional info would be greaty appreciated.