In my search for an automatic BREP node generation (here) here is a little script that puts sections on connected (or not) lines. The transition on nodes are done using blend. 

As input you need

1) lines (not polylines)

2) section(s) in YZ plane with the center on (0,0,0), but it is not mandatory, you can provide one section per line

As parameter

1) you can rotate each section per line,

2) choose bulge for blend ...

Blend type n°2 is a personal blend (the bulge as a dimension not like rhino bulge)

This definition is not intended to generate correct 3d object as Rhino can't join the BREPs in one BREP. But it is good for visualization. 

Need : Sandbox (http://www.food4rhino.com/project/sandboxtopo?etx)