extracting isocurve from mesh to create structure

Hi all,

I've been working on generating minimal surfaces with grasshopper and kangaroo to create building enclosure and spaces.

I have decided to use a series of ribs to create the structure for the enclosure, but I cannot get what I want from the model. I'll try and outline what I want coherently;

-I start with 3 points/openings within an arbitrary mesh for the purposes of this testing.

-Then, using a minimal surfaces script I push and pull these points/openings to create a surface.

-With the desired form I now want to create structure along the surface, radiating from the centres of the points/openings. I also want the radiated structure from each centre point/opening to stop, or merge, at the intersections with each other.

The problem I am encountering is how to actually extract this from the mesh. I have tried to do it manually with meshtoNURB and extracting isocurve but it does not get the desired result.

Help would be greatly appreciated because this is the only thing stopping me from continuing with my work as it is the key the project.

I have attached my mesh and a a script I was trying to develop to make it do what I need, but gave up on it.

Thanks,
Amar