I read the excellent tutorial on hull modeling available here and am thoroughly smitten with it. I now find it very easy to model an almost-perfect hull from little or no source information, then refine the result, create lines and finally create a developable hull from those lines. Very quick, very efficient!
Image © Gerard Peterson. Linked from http://en.wiki.mcneel.com/default.aspx/McNeel/HullMod.html