Looks interesting...don't recall seeing this one. Not quite sure what size this is. By my eye and some rough arithmetic NOT including seam allowances...
Small blocks would have 4"HST and 1"frame to make 6"
Medium blocks would have 6"HST and 2"frame to make 12"
Large blocks would have 12"HST and 3"frame to make 18"
Inner border 1/2"
Outer border 6"
Finished size approx 85x109
Always give credit to your source(s) for ideas/inspirations. Hope this helps.