Problem with sweeping non planar curves

I am dividing a certain amount of curves and trying to sweep horizontal vurves between those points.

Firstly, i am getting an error while trying to interpolate the points or create polylines. Preferably i would like to interpolate the points into curves for more round and smoother curves.

Secondly, the sweep mechanism seems to only work for the first curve at the bottom? I believe this is because it is planar and the others are not but i may be wrong.

Any tips or tricks? Thanks in advance:)

sweep curved between (75.8 KB)

It seems you have a bunch of duplicate curves from the beginning…

sweep curved between (77.9 KB)

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Great, thanks:)