The creator designed his working units inspired by ants but with some “minor” upgrades.
He is proof that humans were skilled workers also so he provided the working units with 3 pair of hands, this arms are way more powerfull and bigger than human arms but they work on the same basis.
Also added tentacles on the front of his creation for manual and delicate tasks
The top part of the body its a variant of super tissue thats been hardened like a shell for its protection because it might have to carry heavy things on its back
The nomads know that this units come always on pairs, they tend not to attack since its not their primary function.
One interesting note its that nomads find “not bad” the flavor of the tentacles and they are kinda soft , specially after boiling