This is a Wroughthammer Rockram, a heavy Warjack for the Mercenaries of Warmachine. Indeed, it’s even more limited than that since Mercenary Warjacks are locked to either human or Rhulic Warcasters and this one needs to go with Rhulics only. I have to admit that I’m not a fan of the Rockram in game; its cannon is good but too short-ranged to get much value out of, and the whole package is too expensive compared to tightly-focussed cheap heavies like the Driller and Basher.
For painting I kept broadly to the same colour-scheme as my other Rhulic Warjacks and eventually I’ll have enough to take a little family photo of them. I don’t especially like the positioning of the right leg as I tend to think of these Warjacks as inexorably stomping their way around the table rather than running headlong anywhere, but it does break up the profile a little compared to the Driller.
Next on the painting table: Tharn Blood Pack.