Droid design I started back in 2012, finally finished and converted into a game asset with the help of my friend David Muñoz, who did the textures and real time engine shaders/integration (see pictures with textures inside Unity and Unreal here:

These images were rendered inside Substance Painter with Iray.

Abner marin closeup 03 nuke01
Abner marin closeup 02 nuke02
Abner marin droid fullbody
Abner marin fullbody contactsheet
Abner marin closeup 04 nuke01
Abner marin closeup texturesdavid

See the textured version by David Muñoz here: