Source maybe Fons and Porters...Template is from one of their magazine which I have no idea for which month...maybe a 2011. Did a little further search and came up with this, hopefully you maybe able to sign in (not sure if this for paid membership or not):
http://www.fonsandporter.com/columns/sew_easy_lessons
Look for long cabin hexagons on this page
I placed a comment on the bottom of the you tube...hopefully, we see a response soon.
Have a wonderful day!