Here's a general guide to get you started with Curviloft 18a:
Because this is a legacy version (18a), it does not utilize GPU acceleration. Large lofts (50+ profiles) will lag. Use these optimization hacks:
Combine Curviloft 18a with Fredo6 Tools on Surface and Vertex Tools . This trinity of plugins will allow you to model anything from a Formula 1 car to a Gaudí cathedral inside SketchUp.