I usually work out the general layout on a scrap piece of paper with some notes of what goes where and then I just sit down and draw the ship. Sometimes things fall into place as I sketched it and other times, the ship sort of draws itself. I usually have background info to help me visualize the ship as well. As for drawings of the hull, I don't have any plans at the moment. I've tried to draw ship pictures before and they always turn out like crap. I should team up with an artist who can draw the ship's hull while I do the layouts.