If you can use strata, just make a simple spline network. Then join, increase segments, and champher. (I have no idea if you can do this in strata but i'm guessing the answer is yes) To do it, Start in top view. Build the splines for only the left or right side...don;t try to get the spline around the whole thing. Then, after you've drawn the very bottom section, draw the next one slightly larger and raise it up. You should repeat the process until you have finished the top of the hull, probably around 30 splines total for best look. Then slect the splines and mirror them. Then do whatever you need to do to get them solid. (skin, surface, add faces, whatever.) Then increase the number of segments and do a smooth or a champher. You should have a nice smooth hull. To get the weathered plank look, open up photoshop and make a grey canvas 700x700. Then paint a few white splotches, and a whole bunch of white lines across it to act as planks. Add some light monochrome noise, and i think a light watercolor filter to roughen things up. Then increase the brightness so ALMOST everything is white. You should barely be able to define the planks and the splotches. Save this as a jpeg. In Strata, load this as a displacement map for the hull. Do any neccessary tweaks to it and tada!. Then export to bryce.