I'm sure you'll need a lot, and there suddenly seems to be a revival or something with this quilt because I'm seeing a lot of posts about the GFG (which is nice because I'm working on one too and sometimes I need motivation) but here's a link for the "show and tell" or quilt a long for my GFG. I have the pattern I'm using on there as well as pictures of my rosettes. Mine are twice the size of yours mostly because I would like to finish it.
http://www.quiltingboard.com/t-151621-1.htm
and make sure your scissors that you use on the airplane can't be considered a weapon. I read about someone that was working on one and the took her little tiny scissors because they could be a weapon.