ok, so we have tray, hood, area all around the hood. ill just say that the only area you dont need to reinforce is the frontish/bottomish part of the ski. my suggestion would be to not reinforce the ski and just ride it, unless your just looking for a project to get your hands dirty with.
im in the process of doing a slight rebuild on my 650 before the season starts and figured out that taking off the black trim and the tray pads and replacing it with hydroturf saves over ten pounds.