I tried my luck at a helmet before I ran into the 405th too. It was junk.
I know alot of people were mean about saying it, but taking a professional stand on the issue, I would agree that your best bet would be to start over, using the 405th resources to guide you along the way.
If there's no possible way you can use pep, then thats fine, you may want to consider something else, such as cardboard, or scratch building. This time you will do alot better, considering you have a gallery loaded with reference pics, helpful people, and plenty of techniques that you never had before when you made this helmet. I suggest you start a new topic, with a new WIP helmet, and go from there. Like I said before, you will be surprised how much your craftsmanship will improve. Take it from someone who has been there before.