I'd been sitting on this for a while, but Requiem of the Wreckers gave me the impetus to finish it. It's a Transformers crossover Iron Man with an energon Scorponok head (with a stryene crest).

Couple of cheats: in bot mode his gun is just jammed inbetween his shoulder and backpack. His harpoon is too long for alt mode and needs to be removed.