The drone would be monkey-sized, rounded, and would have red eyes peeking out from under the shadow of its carapace. They would also be beige in coulor, and their exoskeleton's fit creates the illusion they are wrapped in it, despite their astounding mobility. In their passive state they would look like those Egyptian jars that housed pet remains, but with two red eyes. When mobile they would look quite akin to if a beetle had evolved to stand upright, and as I stated in the post they would have four clawed arms(think an insectoid version of the arcade claw) and possibly small mandibles. I think that's about it, they don't have a thorax, and having antennae in a sandstorm would be useless so yea.