Here is a Primaris Calgar conversion that I did. I think he turned out OK. There's still a bit of jank here and there that needs cleaning (like the blob of
GS on his iron halo that I have no idea how it got there), but he's pretty much done. Hoping that primer and paint would cover some imperfections that I can't quite get right (I am pretty bad at greenstuff molding). I know that the hammer's haft looks particularly rough, but once painted, I'm hoping to make it look like the crosshatching wore off in several spots from hundreds of years of use.
His right arm is from the old assault terminator kit, with the hammer replaced by the two-handed daemonhammer from the Deathwatch kit (Inquisition's gift for his service). His left arm is from the Calgar kit. I cleaned off the excess ultramarine stuff from the fist, trimmed off the bolter muzzle and replaced it with a flamer muzzle from the Aggressors kit. I think it looks pretty OK. The thick cable on the back of the arm passes as the fuel hose that is routed under the cloak, and I glued a pair of trimmed meltabomb parts over the ammo drums to make them look more like fuel tanks for the flamer. I also flipped the flamer upside-down because it seems to have more sense to have the pilot light closer to your fingers than the actual flamer nozzle... not that it matters. I decided since the whole thing is wrapped in the powerfist's forcefield, he actually punches the nozzle inside his enemies and then burninates them from the inside when he feels like REALLY sticking it to them.
I left the ultras bits on his loincloth and cloak because my Chapter is technically an Ultras successor but they are regarded as prodigal sons at best and elicit the awkward "ugh, that weird relative again" attitude at worst from their progenitors. So, they display an occasional inverted omega out of respect for their heritage, but generally don't wear it very much.
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