[/LIST]Looking good. A few things to think about when making the hinges:
1. The helmet is curved, so straight hinges might not work in all conditions.
2. All pivot points need to be parallel to each other (pain in the butt with curved helmet).
3. A double hinge is a good start, but won't give you full control of the faceplate position at all points of the open/close.
4. Positioning the second hinge so it doesn't show while open/close.
It took me almost 4 months for me to develop something I liked. I didn't get to devoted until the last few weeks. I had Autocad on my side and a little advice from a mechanical engineer. My hinge system has 4 binding posts aswell, but I also have the chin hinge, so that was an extra 3 binding posts. For the left and right side, A total of 14 binding posts and 6 hinge pieces all in the temple area.
Demo video:
YouTube - Ironman Helmet Hinge demo‏