The Doberman is described now as a crawler, so I'm picturing a mini-tank. The Roto-drone I describe as a trash can with heli-blades in the centre, Gun mount on the bottom, sensor mount on top.
imagine them as you will, i'm just providing the pics i find online from the original books.
the one that really gets me is the steel lynx, i've seen all sorts of idiotic pics of what people think it looks like, ignoring the original images, or even the image of one in SR4A (pg 96)
besides, it's not that hard to add treads to a wheeled drone (look at the ANDROS EOD robot for a reversal, it's normally tracked but has wheels that just bolt on)