Good thing you're not asking for too much!
As mentioned in earlier messages, SS JOHN LYKES was built as a C1-B design cargo ship. See http://drawings.usmaritimecommission.de/drawings_c1.htm for profile drawings of C1-B designs. Scroll down about half way; JOHN LYKES is mentioned by name as having been built by Federal Shipbuilding and Dry Dock Company, Kearny, New Jersey, with a representative drawing of the five C1-B ships built by this company.
Also see http://drawings.usmaritimecommission.de/drawing/drawings_c1_b_des_fk.htm for a technical description of these ships.
A careful reading of the technical description and reviewing the drawing of the C1-B design leads me to believe the ship may have had the following decks. Those marked by an asterisk (*) below are my terminology; the names of the other decks come from the technical description. From highest level to lowest:
flying bridge *
bridge deck *
lower hold/tank top level *
The four upper decks can be seen in the profile drawings; the decks below the main deck are within the hull and are assumed, based on the technical description.
As for the size of the cabins and toilets (heads in sailor-speak), I haven't the foggiest idea, except probably small. The technical description mentions two owner's staterooms on the cabin deck which were likely larger than typical crew quarters.
In your experience the ship apparently carried a number of civilian passengers, the accommodations for which must have been in addition to standard crew quarters. Perhaps the second deck, one level below the main deck, was fitted out in some way for passengers, surely in less than luxurious style, but again I would have no idea. JOHN LYKES served as a troop ship so there must have been extensive reconfiguration of the below-deck area to house troops. Perhaps there was further reconfiguration to accommodate civilian passengers.
Caveat: since JOHN LYKES and similar ships have long since been scrapped, I have no first-hand knowledge of the layout of the ship and the above is speculative only.
There was another thread on the message board that also had to do with JOHN LYKES. A person named Nancy Ranella left a message to say that her grandfather had served in this ship and that she has many pictures. See http://members.boardhost.com/armedguard/msg/1232853847.html. You might want to get in touch with her. Her e-mail is firstname.lastname@example.org.
Ron Carlson, Webmaster