I have some of the Japanese kabuto helmet done. The five rear plates and the lower front, I call the brow plate. Current parts being made is the visor and the lower ring called a Koshimaki that is used to mount the lining and the neck guard. The last part that will be made is what I call the forehead plate that has the fin style on it. Please see a earlier post for what the kabuto looks like when completed. The screws you see are temporary and will be replaced by acorn shaped rivets.
Front view (showing brow plate)