The Brothers Brick Lego website has a fascinating post by Ben Caulkins, who spent 6 months building Master Chief armor completely out of Lego.

(I)t was after I saw some really amazing LEGO creations at my first LEGO convention, Brickworld, that I really seriously started thinking about it. At first it was just a fantasy, which is reasonable enough, I mean, come on, a full-blown LEGO Master Chief costume? It is pretty ridiculous. But when I started to take it seriously, I finally realized that it was possible, and I committed myself to it.

I put a surprising amount of thought into which part I would construct first, and I finally settled on the helmet because I thought that if I could do a convincing MOC of the Master Chief’s helmet, and be able to wear it, I could do the rest of the suit.