Step 3: Layout, Cut and Clean your plates.
Once your happy with the layout fire up your jigsaw and start cutting out the brow band, bands and top. Do not cut out the cheek plates, nasal or slats until you have the dome of the helmet assembled.
Once you have all your top plates cut out clean up the edges and put a nice bevel on them. You don't want to have any burrs or sharp bits anywhere on them. Any point that may come in contact with you should be rounded out.