A Robot faction would be a great addition to the Death Fields. I really like the generic robot men from the Will Smith movie I Robot. Not the advance model that goes on a rampage. I mean the older models.
You could do sets with armed and unarmed robots, and some robots on tracks ( like the one in the Lost in Space movie) or wheels. Big guys like the LiS robot, and smaller ones like Wall E.
You could also do hover bots, like the ones in the Black Hole movie.
The possibilities are endless, and they would have great value to players of Death Fields and RPgers.
Just avoid making them look like Terminators or Necrons.