Exoskeleton seems to have some issues, there are tons of discussions on this forum here and there
https://www.grasshopper3d.com/group/exoskeleton
You could use Dendro
or Fattener from Daniel Piker
Or my old and buggy YANG
If you want to play with it play with one node at a time.
As it outputs surface, you could use them to make a SubD version of the node…
Lattice_Exoskeleton.gh (103.5 KB)