Exoskeleton meshes not joining??

Hi,

I have just started using Grasshopper for university so please excuse my ignorance.

I am trying to use Exoskeleton to thicken lines to use in an architectural rendering.  My first few attempts did not work (1 and 2 in the attached .gh file). Attempts 3 and 4 both work, but it looks like ExoW is working on individual lines rather than the collection as a whole, if that makes sense. 

Part of the problem is that I do not know the correct terminology to search for help. Could anyone please give me some tips of key words to search for, or even better some pointers on the script itself?  The input geometry has been internalised, and after that point, I use the Topologizer and Exoskeleton plug-ins. I generally work in Rhino 6 but also have Rhino 5.

Thank you very much

Exoskeleton%20help2%20attempt3.jpg