I'm just wondering... why has no one gone the seemingly obvious route with the face mask opening system?
Everyone I've seen attempt this uses a complex hinge system. Why not, instead, use the method designed into the helmet? There are two trenches on the top of the helmet right above the face plate on either side. These line up with the two bolts on the upper part of the faceplate. It seems obvious these were designed as a track to carry the faceplate up and over the top of the helmet. The trenches would just need to be extended under the faceplate, the shape and angle of that extension making the faceplate clamp closed as it slides down on the track.
Has someone tried this and I just missed it?