I’m kind of stunned – I wonder how it looks on the racetrack. wrt the structure and safety, the LED’s, battery, and wiring are probably pretty tiny, so it could just sit on top of the outer functional layer, and it wouldn’t be too expensive to crash-test the whole set-up. I think I read that the diamond helmets were for show only, because to use it in a race, they would have to be strength tested diamonds and all.