As I promised, I'll try to help you.
1. ExtrudeGenerator + ShapeDesigner-2.0.0.exj works very well.
Notes: According to the definition of "Sweep 3D geometry," you must have a shape (closed polygon) and a path to follow (a closed or open 3D polygon).
The program must receive both polygons.
The user must be able to create or modify the path to follow.
I noticed that you added controls for what we requested.
BUT you kept the old ShapeDesigner-1.2.2, which is a mess, instead of using ShapeDesigner-2.0.0, which is much better.
Please stop messing with my one and only brain cell to test my intelligence. I don’t have one.
2. It seems like building your own plugin is a difficult task for you.
I know it’s not an easy task, which is why I sent you the "PluginTemplate" to help you out.
3. If you cooperate properly (no tricks), meaning without mixing old and new source code, I can help you with your new plugin within the limits of my time.

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