I didn't know that some of them were still running. Interesting.
The two first are from the SS Jeremiah O'Brian. Simply change the museum for a cargo hold.
Liberty_Deckplan_1.rar
Liberty_Side_view_1.rar
The file below is another side view of a Liberty Ship, the SS. Fort Halkett. It's another side view. Although it is redundant with the other file, I find that the silhouttes of the transported vehicles are a nice detail to get a quick idea about the relative dimensions of the cargo holds:
Liberty_Side_view 2.rar