I am slowly converting away on the Khorne Feral Titan. The wheel base is from a very old 40k Khorne Blood Slaughter. The arms are from the same model (power fist) and a Epic Ork Gargant (chain saw). The head is a resin cast of I think an old Juggernaught of Khorne from 40k. Right now everything is just pinned together and crudely green stuffed for the torso “volume”. Adding the rest will be a major challenge for my minimal green stuff sculpting skills.