This looks similar to the big block that I saw of "Sewing with Nancy". Yours had sashing and a different size but the arrangement is the same. I have made a couple of these and they are fun. I have fabric picked out for another one.
I Googled Sewing With Nancy big blocks and found the 2 part episode with Debbie Bowles you can watch online about how to make this quilt.
http://video.wpt.org/video/2365057122/
http://video.wpt.org/video/2365063804/