Clone, Try to use Circle instead of Circle CNR to generate the section curves. Circle requires only the CPlane and radius and it plays very well with your model. You might want to divide the radius by 10 so it won't grow dramatically.
The jaggy surface in the very beginning (with very dense section planes) is only showing the preview, not the final model. Bake the surface and you will see it become a beautiful thing. Junehao
