I meant to add (but it was late and I was tired), that for anyone who is interested, there are deck plans online of the ship I mentioned:
couple of things to note:
it was small (6500 tons or so)
it was old (originally built in 1914 IIRC - it held the Guinness record for oldest ocean going passenger liner when I was on it) [1]
it had four incarnations - as a cargo ship on the east coast of the US, a pilgrim ship in 1950ish, a luxury cruise liner for the Italians from the 50s and the bookship I worked on from 1977 I think.
we weren't under military discipline - I suspect Imperial Navy ships and training would much better handle the week in Jump from a crew psychology point of view.
http://www.ssmaritime.net/Franca-C-Plan-59-1.jpg - I can see my cabins! (I had three - one four berth down in the bowels, one two berth down in the bowels then back to a fractionally bigger four berth with a porthole right up near the deckhead)