Sweep along closed curve possible?

I am trying to model a circular truss system by sweeping a profile along a closed path.
A circle was divided and the resulting points form the polygonal path.

Sweeping along a nurbscurve is only successful if the curve is not closed, a closed curve always fails.
Sweeping along a polycurve instantaneously freezes dynamo.
Sweeping along the individual lines produce open edges in the corners.

Has someone any ideas what else I could try?

These threads should help you: