Mate, I not putting down what you have there but the FX buckets are nowhere near accurite. If you restore it, later down the line you will be thinking why did I bother spending all that time and money on this. Even if you do a fantastic job at the end of the day it will still be an FX.
Sell it for a few bucks to start your helmet fund and get one of the seconds that are available here from time to time. They might be cheaper than you think. Then you will have a helmet that is worth putting the effort into.
All the best in what you decide to do.
Rob