I slept on it and yeah I need that Thunderbird 5 solution: 

I belive, however, that as a user inside the helmet and not looking at it, 350mm will feel much more spacious.

The front window is 100mm, which looks to be enough to cover the nose and hopefully enough to provide fresh breathing air.

I'm probably keeping the TyMist name. Or perhaps TyCyMistify.

I should've mentioned this earlier, but the LED ring is like the RGB one on Alexa powered devices. The idea is to get the PLDC to reflect some of that light for a Phillips HUE like background effect.