I think the only reason people are being aggressive about this because we hold all of our members in the highest regards and personal safety is an enormously vital issue that everybody takes very seriously. We aren't accusing you of stealing an idea, and we certainly aren't trying to tell you that you can't do something.
Yes you may not have specific motorcycle laws where you live, and yes you may have experience. We don't have the right to argue with those facts.
There are however 2 things about what you are saying that make me nervous. The first is that you said this is to benefit somebody else. You may be a great rider and whoever you are making this for may be too, but there is a tonne of liability here. Let's face it; motorcyclists fall all the time. Even good ones. I once heard a veteran biker say, "there are 2 types of riders; those who have fallen, and those who haven't yet". Asking people to make a helmet that they know will be used to make a protective item for somebody is a lot to ask, especially since it isn't even for you. There's just no way to account for someone else's skill.
The second thing is that the padding inside is not the only protection. If the helmet was made out of fibreglass, it would splinter and probably really mess up the person's face. If it was any kind of molded material that someone here would make, it would likely shatter. The companies that make helmets put loads of R&D into their products, and there's a reason for it...
We aren't trying to castigate you nor are we trying to judge, but you need to cool it and realize where people here are coming from.
If you are serious about this helmet thing then I'd suggest you either make your own, buy a licensed costume helmet, or settle for modifying a real motorcycle helmet. I can't condone anything other than modifying an existing helmet, and I think expecting "padding" to protect you in a crash is ludacris, but good luck anyways...
