Transforming the base model to cubic diamond structure version

Hello
I already help here.

But without opening your file it seems that your object is not a solid. So it has no interior no exterior!
image
You’ll have to make it solid (give it thickness)

I opened the Grasshopper and I see no modification from what I posted and no use of the other script I posted there

So I think you want someone to do the job at you place. Not sure you will learn a lot!