Intersect multiple surface/Curves and get the intersect part as a closed curve.

I am new to grasshopper.I download a Vornio and delaunay definition. I would like to get all intersection curve/surface and make the intersect part as a closed curve/surface. I tryed use the brep to get the edges and intersect all the curve. I also tryed use Brep/brep. Turns out not working. I was wondering someone could help me to understand the logics behind and offer some ideas how to work on it. 

Ps Attached is the grasshopper file.

question%20for%20intersection%20surface.gh