I, for one, would like to first finish making all the halo stuff I have planned, I am still working on some pep. parts on my master chief armor and if I actually make it, (and make it good) I will consider making a metroid-based suit.
I would love to make a samus aran suit, but it's a female character, and I just don't feel right wearing a suit made for a female character, that said, everyone please take a look at the marines and more recently, PED marines and Demolition from the metroid prime series (metroid prime 3 has the best example) their armor looks really good, if we could get a few marines like in prime 3 together at a convention, that would already be pretty cool.
And the shoulder pads aren't as hard as people think, I mean it's just doughnut shaped circles with a bit of detail, if anything, it could be made from card-board, resined, fiber-glassed, then the detailes could be bondo-ed in.
The marines are pretty hard to find pics of, though...so probably, someone would need to get screenshots.