3D sculpt maps as boat hulls

I tried modeling a hull in "wings 3d" and exporting it as a 3d scuplt map, but without any success. It seems there is a problem with the export plugin... I couldn't even export a sphere!

I think scuplties are a must to design boat hulls as it is the only to get a proper shape. However, i'll have to find adequate software. An IGES to sculpt converter would be ideal, IGES being considered the "standard" exchange format for nurbs surfaces...

On the left, what the boat looks like so far.

The rig is done

I got a bit sidetracked building my boat, but I managed to get the rig done finally, and the cockpit is progressing. I was thinking about using sculpted prims to do the hull, which would give a much nicer and more realistic shape, all in one prim only.

I downloaded a converter from rhino .3dm files to scuplt maps, but I can't get it to work... So I will use another 3D soft as an intermediary step. That's the plan, anyway...