The Ultra Iron Man was created using ML house of M Iron Man for body, the head was from ML 8 IM with a sculpted mask by Magic-Sculpt.
The backpack was created using upper part of Star Wars destroyer droid, and then I combined its lower part with a capsule toy machine gun. The belt came from LCBH Super Patriot and the pistol from McFarlane Sam And Twitch set. The repainted base came from Marvel Legends 4 Gambit.
I repainted whole figure with multiple layers of metallic paint, dry brushed then finished with topcoat.
This figure just has taken me few weeks to complete.
I do like your custom as well. Your custom figures with very nice porportion.
p.s. Figurerealm filters out my pict link. But you can find my post in "thefwoosh", the bigger pict over there.
I made them only when I've free time.