After Figure Realm member Big Hank gave me a bunch of parts, including a complete Sigma Six Duke, I knew right away that a killer sentinel could be made from Duke's inhuman face and proportions.
The build is the Duke figure with a ton of figure and model parts added to it and finished with Folk Art metallic paint.
Some parts included in the build include stuff from Gundam, Zoids, Iron Man (for the whip-tenticles),Armored Core (for the big cannon on his back) and tiny Doc Ock graspers from an old diecast toy added to the ends of the whips (my favorite detail of the build).
Numerous GI Joe panel decals are sprinkled about as well for a mass-produced look.

Looking at Nimrod (in the comics) it seems that Sentinel models get smaller as they get more lethal- making this is sorta the 'War Machine" of the Sentinel line- tons of bang for the buck.

As always, questions and comments are welcomed!