Hi, i've been trying to create a pattern like the grouping voronoi in the photo but i just couldnt. and i don't know how to form a circular shape like that.

my attempt was using voronoi and kangaroo to find a form with voronoi pattern on it, and now i have the voronoi curve but couldnt make a surface and holes like whats in the photo. 

i realise what i did wrong was that the each group of the voronoi in the photo is flat and that connect woth another group. and mine is just different voronoi units, i couldn't cap them or make the surface like the photo...  i have to unroll and send this to fabrication, but i cant cap the extrusion or just simply create surface with hoels in the voronoi.

Please help me ive been stuck for a long time!!! Thank you !!!!