I figured I'd test myself a bit after getting the initial army done, so I pushed things a bit further.

Every floaty cube thing gets its own standing army, and the cubes are arranged into a much bigger cube.  It's hard to get a really good camera angle of this though.

This was actually pretty easy to do.  The trick was getting that initial "aha!  I get it now" moment, which hit me about halfway through the class.  I think I can see why people have trouble with the node system, it is definitely confusing until you can get it to click with you somehow.

I thought of adding some more interesting materials and other stuff but the whole system felt like it was going to explode at that point.  Framerate was getting a bit wonky.  Possibly there just might be a few too many of those sentinel guys in there.

I think it's a good test & demonstration though.