It is a very little known fact that Julian (Archie Sonic) had been working on robotics for some time. Before he thought of the roboticizer -- erm, stole it -- he had been working on robotics of his own. He wanted to be sure he knew his shit before ripping off Sir Charles' design.
This is one of his early robot units, which after many years has been repossessed by an interested party and retrofitted with a light machine gun.

Design isn't canon with Archie Sonic, this is more TSAT lore. Not sure if I'll actually have the unit make an appearance at any time, though.