How to create a space frame truss structure 1 from SUBD surface in Grasshopper

Hi everyone, I want to create a space frame truss structure 1 from SUBD surface in Grasshopper. Can someone please help on this? I have attached the rhino file for reference. or can someone help to convert to nurbs surface (NOT Polysurface).
thank yousubD spaceframe.3dm (191.9 KB)