I know they all look the same, but I'm not a modeler, so I wouldn't know how to bend their knees. Perhaps using just a few would give a more realistic idea. And of course all the brothers heading for the water makes them look the same as well. Your idea about the defensive circle is nice, njeneb.
Here's another gang (one population), but if you look closely, you'll see the beasts are individually colored, using my method of image map projection. Originally 1920x1200px, it took 8 hours to render on 0.65 and AA7, due to the reflective mud, the water and the high cloud samples necessary (128 or so). No GI, just 3 extra fill lights.
---Dune