Best material and method to make Daft Punk style helmet?

I want to make a helmet similar to those worn by Daft Punk and I wanna know what I should use (as it has to house cameras so I can see and just be sturdy). I figure metal is far too heavy but some plastics may be flimsy. The design will be a circular (or maybe square) smiley face that looks like this: http://profile.ak.fbcdn.net/hprofile-ak-snc4/187749_100001262882561_4257681_n.jpg