Voronoi pattern on a polysurface

Hey all,

New to grasshopper here and trying to learn from various online tutorials, however I keep finding myself stuck and I'm sure there is an easy enough method to do what I'm looking for. 

This is what I'm trying to do, but with the shape outlined below.

I'm trying to create a voronoi patterned shell of the shape posted below. I've tried a few methods, the most recent being using the surfaces as a brep and cutting a 3d voronoi with them.

From there I extracted the curves I wanted to create the voronoi shell pattern from, and was hoping I could use some other method to create a voronoi pattern from these curves, however this hasn't worked (I'm guessing because these are curves and not straight lines?)

Can anybody give me a few pointers on how to make this work / if there is a better method to accomplish my goal 

Sorry if my terminology is wrong, like I said I'm new to grasshopper!

Thanks,

Neil