^what they have stated should be in the ship bucket bible. BB and WhyMe would probably concur with me. When it came to drawing Japanese vessels, there were a lot of line drawings which, though they had the general characteristics, were vague in terms of nitpick things like davits, railing, markings,...
That, or you could even use a light or darker brown for the lines if the specific ship uses rope. Darker shades can be uses to imply areas of connection or small rigging devices.