The Mantle conveys a 3+ Invulnerable Save to He'stan so I went for a chunky scale appearence, rolling several sizes of greenstuff balls and smashing them in place on the plastic cape. A few teeth from Fantasy Ork sheilds and a Tyranid node accessory reinforce the whole "hide" motiff and I think make that awesome save of his believable. For his Gauntlet of the Forge -- a heavy flamer, twin linked just because it's his -- I scraped the wolf skull and bones from a Space Wolf power fist and set two Imperial gun turrets from Battlefleet Gothic on it. These have to be shaved and trimmed with the curve of the fist in mind and the gun barrels bent downward for the same reason. The spear is a master crafted relic blade and needed a spiked ball from the Empire Flagellants set on its end, just because.
The business end of the spear is made from two different Ork knives/Choppas. The illustration in the new Marine Codex has a clean looking blade, but I liked the serated edge better. A spike from the Dark Eldar accessories completes the halbrid.
Not pictured is the simple bolt pistol-in-holster glued to his right hip because first off, he's a Space Marine and needs a firearm despite his weighty arsenal, two, because it's partof his wargear and three, because he's hardly going to draw and fire it with the gauntlet on his left hand. Now to paint it.