I need to know the detailed layout of a common 1910-1925-era TRAMP
STEAMER, likely via a cross section or cutaway plan. The ship is
approx. 288 ft. long.

This class of steamer is commonly referred to as a "Three-Island Tramp
Steamer." There's a great example of one here:
http://www.nzcoastalshipping.com/dutchcoasters.html (look for the one
called "Venture").

There is a rudimentary diagram here:
http://www.bevs.org/diving/wkgenera.htm . I need better detail and
names of different compartments and accommodations, etc.

I will also pay extra for photo reference of the same ship (interiors
and exteriors).