Curve Intersection

Hello everyone.
I am trying to create the model of this picture, but i dont know how to trim end points.
And also if you have any idea to make all the model in an easier way, that would be great.
Thanks. (13.2 KB)

Kinda like this?

Rotate (21.7 KB)

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thanks a lot for your help, this will be very helpful

You can also try this but it need more work
paper (20.7 KB)

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