Greg Broadmore and I were fortunate enough to collaborate with JJ and his team, and produce some new designs for the short. Here's some of my work:
BLR wanted a large mech unit with a human pilot, and I wanted to design something a little different with such a fun but familiar brief. With other autonomous robots running around it didn't make sense to have the pilot sitting in a traditional cockpit or controlling the mech with their limb movement. So I put the pilot in a low slung tank, where they would be ensconced in inflatable padding, and controlling the unit through a neural interface and display screens. This would allow super fast entry and egress for the pilot, and would look pretty creepy too.
Of course that means the pilot isn't strictly necessary so the pilot tank could be swapped out for a big ass ammo tank for a big ass gun.
BLR were also after a larger version of the original Keloid robot, and a human soldier with exo-skeletal gear and armour.
Here are some renders of the final models, and some screen grabs from the video: