Model DreamCAST in Rhino 3D

1. Clean original curves (turn on points and compare to point count of your original lines)
2. Use "sweep2" on top curves, using the two identical curves for the cross-section. Extrude the base curves. Not that the curves have not been filleted at this point.
3. Trim these surfaces to each other, join, and cap (the cap is not necessary unless you want it to be "solid").
4. Use "FilletEdge" with a .4 radius on all but the bottom edges.

- Heath Rhino Newsgroup