Whipped this up as soon as I saw it, but it looks like someone beat me to the punch. Mine's a little different so I thought I'd post it anyway.
I like the darker grey on the other one a little better, but I love how yours has the hatch behind his head detailed, the yellow missiles and the white on the face to bring out detail there as well
Call me crazy but I would love this guy cast in just all dark dread plastic with minor paint apps to the treads and eyes and then spend all the paint budget on wash to bring out all the details
Yeah that's what I was thinking too. Keep with a g1 color scheme and add the wash to make all those details pop.