Tartan, I did not find a tutorial for this particular pattern, but Rachel Hauser at Stitched in Color reviewed the ruler making this pattern. I had no trouble using the ruler, but there is a bit of a learning curve. It goes together great but you need to follow the instructions to the letter. The sewing is very forgiving. Also I pressed all my seams open to help with the excess bulk at the center of the block units.
http://www.stitchedincolor.com/2015/...rve-ruler.html