I like any of the more biomechanical designs where they are on their back legs. I don't mind the praetorian as a wandering queen looking to establish a new hive. To me that take makes sense, at it is still built to fight at that point. The queen can fight, but the queen should be laying eggs. Praetorian lets the queen wander from point a to b without having to suppress egg laying, and maybe more easily snatch up host animals without them being alerted to the fifteen foot tall monstrosity lumbering toward them.