Voronoi on curved Surface

Hi, my name is Christian, i am a student of architecture and new to this group,

i am kind of new to grasshopper and am trying to do an voronoi structure on a curved surface. But everytime i try to split the surface with de voronoi curves, i get an error, or i cant do it properly. So i am attempting to get the surface outlined in black, can anyone help me with that? im am sending a picture and the archives.

Many thanks in advance!