Atlas and P-body both have bodies and can walk around, where as Wheatley never really had the ability to walk around on his own. Here is what I think his body would look like if he were in charge of making it. I tried to stay true to the color schemes, and I even made a companion cube to go with him. I used a Wheatley key chain, Cleatus torso, and Stel arms and legs. The gun was sculpted from scratch. Wheatley is removable and the light still works, so you can still turn him on.
And now we wait patiently for somebody to turn this into cosplay.