Yes Sketchup can maybe help you in very detailed model ;) (box modeling cool as before project )
But seems Rhino will be more adapted if you don't want use a specialised program! 1100 large cabins !!! (nurbs modeling better for exact geometry! )

Some ships with Sketchup ;)
http://karanak.deviantart.com/
http://www.conceptart.org/forums/showthread.php/234083-Making-of-Dreadnought
It's Sketchup modeling! by Karanak