I posted this helmet a few weeks back. After being asked to write an article for it on Blender Nation I pimp it up a bit by adding a cool glass shader to the visor. And then couldn't help myself and created a tech sheet.
If you're interested I created some videos to go with the article.
https://www.youtube.com/watch?v=HmCXjrIj8aU
https://www.youtube.com/watch?v=4GIXR87LcS0&t=23s
https://www.youtube.com/watch?v=5iANLB_-ZnM&t=17s