It's like I don't need one but... couldn't help myself had to make one. And the good part is that if it comes out looking bad... then oh well fun while it lasted.
I'm making it out of foam core and paper mache XD
Here's what I have so far:
(the tape is kinda just holding things in place so it doesn't like explode)
Everything I'm using is just stuff that's laying around in the house. As a guide I used this: http://www.instructables.com/id/EB96DTBQ13ES9J6YYX/
dude made it out of cardboard.
Once I'm done making the dome I'm going to pretty much coat the whole helmet with paper mache. When it dries I can pretty much sand it down to be smooth and then add the details.