I know I said, I'd post a 'how-to' on the Iron Man armor, but I decided to do a Halo-themed helmet instead. I'll post a how-to eventually. Padding up my portfolio ATM and decided I need to crank on another piece. Have not polished this thing up yet, but it's at a state where I feel somewhat comfortable showing it off. It was difficult to find a definitive version of the helmet. I scoured flickr, the replica prop forum and the interwebs, in general. Lots of stuff out there. Decided to take the aspects I liked and add my own flavor to it.

Edit: Adding a quick screenshot of the helmet exported from MoI into Zbrush just to test things out. Man, do I love being able to model with precision in MoI and then noodle-around with that same model in Zbrush. So much fun!