OK, was actually working on the CCP (Carrara Community Project) and trying a few diff things I just haven't been happy with the shape I get in the vertex modeler so I went back to my tried and true Spline modeler, got it all done, but notices this error in shape after a render.  It's find on the front view, but the back view is all screwy.. (Right hand of the image below)

any ideas??  I can move the point on the sweep path to make it go away, but then you get an overlap and the material blacks out funny... :scared:

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Hexagon, Carrara, Sculptris, and recently Sketchup.