Hello,
I might be a year or so late, but just was browsing around in posts, and ended up at your post.
In case you are still interrested in different ways to draw a hull, I attached my way of drawing. It is certainly not the best way, but it's A way.
Using the original linesplan of a ship. Each line at different levels have a x,y coordinate, which put together gives the lines of the hull. All these lines stacked on top of each other give then the complete linesplan, which you can then close on the outside to create your hull.
Basically the system works as how Delfship uses their program, but there I always turned up to set the coordinates wrong, which resulted in very strange shapes suddenly.
Hope this helps, enjoy