Very cool! It looks like it is 14 squares X 17 squares. You could always make it shorter or longer.
If you used 6 1/2" blocks it would measure 84" X 102"
If you used 8 1/2" blocks it would measure 112" X 136
I personally like the bigger blocks and mainly because I have the Accuquilt Go Rag Die and it is 8 1/2"