Which version of Bryce are you using? The hull could be done with terrains probably.

In my boat above I took a cylinder elongated along one axis and plced on it's side and using negative booleans and intersects created the hull. The curve lines are done with metaballs constrained to a path (metaballs are in Bryce 5 which is why I asked which version). The sail, quarterdeck and front platform are made from terrains, the height maps made in photopaint. The curved yardarms were created by taking 2 cones and with a top down view did a height mask render. Then took that into photopaint and skewed then taken back into the terrain editor and loaded as a lattice. Something similar was done with the sail. Hopefully this will give you some ideas on how to proceed.