In the book "Invitation to Creative Playing with Origami" the used paper is A4 (21x29,7cm) and the division on the short side is 16. Based upon that you make a triangle grid. I folded the model from squares too and used a 24 grid on one side. With this 24 grid the paper gets a bit too long on one side so that it is recommendable to cut a small strip of. A division into 11 is not possible, count again, I'm pretty sure it has to be at least 22. Only make the division in one direction, because what you need is a triangle grid. Here you can see the model folded by me from elephant hide: http://goo.gl/Ob5O5O The one in the middle is from a square and therefore has more stars, the other ones are made from A4 paper.
Nice Greetings Anna
