Do you think maybe he was holding it that way because they were waiting for the paint to dry?In the end scene, you totally see the dude running with it in his hand, holding it like this.
http://uploads.tapatalk-cdn.com/20161228/bf4d3b3a4652070a3156e14a1cbd808b.gif
That hand position one of the factors I'm using in considering the size, in addition to scaling based on the gloved thumb in the picture. These guys are 75 wide and I hear the R2 slot is about 75mm also. I think it should be this width and perhaps a tad longer than I made it. I unfortunately don't have an R2 of my own to test it.
That's a joke, btw.
Also, do we ever see the other side? Could the gold circles be on both sides?
EDIT: Looking again at the screengrab, it looks like your top radius may be slightly off. I'm not sure, but the real deal seems to have less of a curve...