Mesh file to surface/polysurface

Hi everyone- I have developed a complex roof with double curvature(nurbs surface) in 3d max and as u might have guessed it will be translated into mesh once I export it into Rhino, with millions of faces/surfaces...

I can manually re-do the form in rhino, ...but I was hopping I can find an easy way to use grasshopper to get the series of contours and be able to have SURFACE/POlysurface . I watched few comments/responds here, but mainly wat was suggested or wat it will give me if I follow the procedure is (millions of tiny juxtaposed- surfaces-),...I prefer to get series of contours to loft them,.... or automatically a surface.....