This custom is inspired primarily by Grimlock's appearance in the War Within storyline. In order to make Grimlock in his pre-earth/Cybertronian mode I removed his dinosaur parts (including his dinosaur head, arms, and feet), and added treads and two turrets on his back. I also painted his head completely black. The treads came from a knock-off Constructicon, and the turrets are from Engergon Sharkticon. I decided not to repaint the entire figure, but maybe I will someday. Enjoy!