There are 6 basic blobs that are the beginning point of your 3D Model in CB Model Pro. They are Sphere, Cylinder, Cone, Cube, Sheet and Torus. The Torus resembles a donut and at first, one wonders just what you can do with it. But, it doesn't take long before you discover that it is one of the most versatile shapes in the CB Model Pro arsenal.
Here is an image that shows how few steps it takes to go from a basic Torus to a fairly complex fantasy aircraft. None of these models took more than 25 minutes to complete. Much of the time was taken by deciding on the next design move... not the actual implementation.
Here are some other samples of aircraft created from a Torus basic blob.