It would be nice armor to make, but its no more difficult that regular MC armor. And plus, only you and a handful of halo fans would know what the armor is. others wouldnt know and would think its from transformers or something. Now on the other hand, the regular old MC armor almost everyone would know who it is.
Im not trying to discourage you. Make the armor and helmet, it looks sick as hell, so i dont see how it should be difficult. It just is more intimidating than the regular armor.