Loft (making a surface from a set of curves (lines)
- Create three b-spline curves and stack them on top of each other (similar shape)
- Using the loft tool create a lofted surface.
- Turn on the control points and edit the shape.
- Offset the surface (surface -- > offset surface)
- select solid (in the command bar)
- enter the depth dimension to offset
- change the direction if necessary
- select loose (in the command bar)