TheNickFox said:
I would also say that if you have your heart set on making an Iron Man helmet, do it! Just don't get bogged down on details you don't need to worry about yet...like electronics.
Especially if you're new, it's easy to get bogged down by a BIG project, so simplify it to get your feet wet. You might start with the goal of making a 2 piece helmet (no removable faceplate) and hone your skills that way.
Then once you've built up the skills necessary, either modify your first build or start a new one and build NEW skills on top of the ones you just built up.
Trying to plan such a complex build up front is a great way to increase the likelihood that you'll never finish.
Good luck.
-Nick