Here's a custom forge lord for my heresy era Iron Hands:

The body is a cyborg prime body from Kromlech (I actually got this as a freebie in an order for other bits). The servo harness is from Anvil Industry (it's the exo lord scale mechanical arm conversion kit). The axe is from the space marine assault squad and the arm holding it is from the current MK3 kit. The right shoulder pad is from a plastic heresy kit (I think the MK3 but could be MK4). The head, nemesis bolter and IH shoulder pad are all from the IH primaris upgrade kit.