This is supposed to be an Ork Dreadnought, but it is a little too big. Made from an old metal Space Marine Dreadnought torso and spare vehicle bits. The arms are Ghazkull's, with legs from an old plastic epic scale Titan as the upper arms. The gun is from a Heroclix Mechwarrior, so it can swivel.
Looted Sentinel. Not in the Codex but could be used as a Killer Kan. Just a regular sentinel, with armour plates and an old minigun type weapon, with a tank wheel as an ammo bin.