I do not have any pictures from the assembly, I will take some close ups of the results and post.
Basically a hog ring pliers carries and closes a metal ring around two HC wires to hold them together. It is very simple but has some caveats: key is one has to "fold" the two sides so that the pliers "mouth" can fit around them, then squeeze; to finish one needs to use zip ties to overcome the "fold" limitation. I also do not know how predator proof the rings are.
In the example above I was able to use old cut off HC pieces to do the entire front of the pens. While a small total ($10? maybe) in this case that would add up if one is re-configuring runs/pens.