Here is what Wheatley from Portal would look like if he had a body like Atlas and P-body. I used a Wheatley Keychain, Cleatus Torso, and Stel Arms and Legs. I made the portal gun from scratch. The Wheatley is removable so that you can still use the light and turn it on. I even made a companion cube for it.
Lovely paintwork on this. I can't tell if it's grey, white, or silver - it all just works really well together.