Ok, I'll take a deep breath and (with reference to the plan here at ET and as best I can do from memory):
To the right of the Captain's sitting room (marked 'Captn') is the navigation room. Above and to right of that is the wheelhouse, and to left of that the chart room and pilot room. To the left of the chart room is the large open space of the funnel casing, with fan trunking etc to left and right of it. Further left, a block of rooms of various sizes which are the officer's washroom, bathroom, toilet and some store rooms. Then a transverse alleyway, then the three rooms which make up the Marconi suite - 'silent room' at top, main wireless room in middle (labelled 'MARCONI'), bedroom at bottom. Finally, just before the stairs, a large room containing the machinery for the lifts.
Further to port (ie up on the plan) moving to the left from the 6th officer's cabin, we have a 1st Class passenger cabin, a toilet, a bathroom, (both for passengers) then two more 1st Class cabins.
At the bottom of the plan, again moving left, first after the Captain's sitting room is his bedroom, then his bathroom, then the 4th Officer's cabin (labelled). Then the officers' smoking room, a pantry, and three more 1st Class cabins.
Hope that makes sense. Fortunately Lester is here to correct any errors!
