That's such a pretty quilt. I took some pictures of the quilt in the video. I see the Sawtooth Star block that measure 12 inches finished and some smaller ones that measure 6 inches finished and 6 inch finished solid fabric squares. This would make the inside of the quilt about 90 inches and the HST's surrounding it would be 3 inch finished.
http://www.quilterscache.com/S/SawtoothBlock.html
I suspect there are going to be some partial seams putting this together. I would put it together from the top down. If you do a close up on the blocks, you will see where you can sew some of them together before sewing into the row.
Hope this helps