I think I'll need 7 1/4yds grey, 3yds cream, and 2 1/4yds yellow since I'm using yellow for binding too. This is giving me some wiggle room since I tend to cut things wrong every once and a while. :P
I'm counting on 5.5in HST's before they're sewn together and 5.5 in squares to go in between. SO that means the HST squares would have to be 6 3/8 right?