Taken from Judge Dredd- Heroes are investigating a theft of old cybertronic robot chassis taken from warehouse. Heroes find a murder victim with head exploded. Heretic uses profane powers to shove human brain into robot chassis and make a praetorian stalker.
Classing it as a Praetorian Stalker will be a big stretch! They have a very definite and arduous creation. Nathan did write some cool rules for a robot labourer in the Dark Symmetry Campaign though, something along those lines might work.
I like going against canon in my games. I’m just using the stats for the praetorian stalker really.