I'm sorry to keep bothering you, but it's happening again.

My co-worker decided to change the size of the circle at the bottom. So I went back to my original curves for the bottom and repeated all the sweeping. I left the network on top alone. But now when I try to create a solid with the scaling process I can only get a joined surface, not a solid.

Nothing can be overlapping because it's all built from the same curves. Here is the new model with the modified bottom.