By my workings you'll need a 26" x 38" rectangle of chicken fabric. 5 x 6 =30 -4"(for your sashings)=26" That is a finished size so you will need to cut at 26 1/2 x 38 1/2. Hope that helps some :D If you want to do it this size you will need to allow another four 6" squares for your corners. I get a finished size of 46"x60" :?: