Sorry if it was already posted on this forum!
Some times ago, I found a damn good 3d file of an Iron Man helmet! This one looks really accurate to me!
The main problems is that it's a very detailled model....and I don't know how to use pepakura (I know there is good tutorials here, but my english is so poor
)
Here some pictures of this 3d files on pepakura!
I can post it if you're interested. I don't remember where I found it (sorry for the maker). But it was a free download.