by Adam » August 13th, 2010, 10:12 am
Compared to the diagrams you provided, the proportions of your model appear to be incorrect. I'm guessing you either started with a sheet with the wrong shape, or made a mistake in the previous diagrams.
Step nine looks like you simply have to fold up all the sides, so that they are perpendicular to the middle. If you look carefully, you'll see that the creases next to the white triangle will become mountain folds (i.e., corners).