"My plan is to give him a giant iron fist instead of a shield" you pretty much remove one of the three iconic parts of Silencer, the other ones are The glaives and the colour removing one of thoose will make him harder to separate from another hero.
long short:combine the fist whit the shield or think about other concepts.
All right the helmet looks great it seems fitting but the gem is too small to notice (A bird eye view game like most RTS) this means remove or a edit, i would suggest 3/4 of the chest gem but you would need to redesign the helmet it self, Now the neck cover is cool a bit too closed to my taste a bigger gap would be welcomed by me and(if you planed to change the neck cover too seem a bit more real skip this) begin completely straight makes it to look boring a good example would be Rubik (dont take it like I tell you to Copy Pasta), the straps seem to be not needed and the chains(buckles)seem to just not fit the style of the hero, also I wish more people came to this thread because it is only my opinion for now(btw hyped for the shield.
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long short:combine the fist whit the shield or think about other concepts.