Alright, sounds good. Just wanted to make sure I didnt scale the helmet incorrectly or anything. Reference photos show that the helmet edges line up with the collar armor, the same way mine seem to line up. Good sign I guess. I want to try and make it as accurate as possible. I'm a bit of a perfectionist with this stuff, but also a cheap-*** haha. I'd rather spend an additional few hours than a few extra bucks. 
Hell, I can always add a little padding under the armor plates to make em appear bigger, if I feel that the finished helmet still looks to big on me.
Thanks for all the advice so far! I'll keep ya posted as I continue working.