http://i61.tinypic.com/am4l05.jpg
http://i61.tinypic.com/oqy74n.jpg
http://i59.tinypic.com/2ujk3gx.jpg
Pretty simple... just add a mouthplate to Scoop and repaint. I did try some other heads but they wouldn't fit in the cabin.
And no, there are no plans for Devastator.