Building your own Iron Man-like suit is asking a bit much, unless you're a dedicated cosplayer. But you might have the inclination (and resources) to throw together part of it -- the mask, a foot. A nipple, perhaps. Take David J. Guyton, who in the clip above just focuses on crafting the best damn Iron Man glove he can... completely out of metal.
Along with being a hobbyist metalworker, Guyton is the author of three fantasy novels, including Blood and Bronze and Soul Under the Mountain.
Going from the video, the gauntlet, fashioned from 22-gauge steel, is made entirely using hand tools, with Guyton carefully cutting and hammering each piece into shape. That's the fun part -- once all the bits are made, they have to be glued onto the base glove one at a time and held in place for ten minutes.
At least the end product is worth the wait.
Guyton also mentions the availability of a template you can use to make your own -- there's even a screencap in the clip showing the link in the description -- however, he's yet to upload it. Not that it's a huge loss, unless you're looking to be the armoured king of your local LARP group.