Here's my concept designed at the sculpt off 2016 (last image is the one I delivered after 3 hours).
Some new renders and a short breackdown.
Hi-tech Semi-rigid material, able to change rigidity thanks to electric shocks, emulating muscular contractions. In case of impacts it becomes almost indestructible and in case of falls and bullets it's able to deform it self thanks to
its memory-foam structure. Before the apocalypse, these units had the role of patroling on the streets and were engaged on delicated missions (where human-units would be in high danger).
After the Apocalypse, the AI uses these drones for fighting human rebels. The unit can change typology of arm (integrated weapons, shields, etc.).
I also made a Turnable GIF, click here to see it: https://www.artstation.com/artwork/Rldlm
Hope you enjoy!