The reason I say is that with the traditional Motorcycle helmet visor method, you have a visor that has a horizontal curvature, but no vertical curvature. If you notice in-Game Master Chief's visor is curved both horizontally, left and right, and vertically, up and down.
So since motorcycle visors have no vertical curvature, would someone be willing to make a custom sculpted spartan visor, with the dual layer details and custom gold paint?