Another member put up a tute on how this was done. She started with 10.5. I tried it out last night. I still came up short on the sizes. After sewing those together and cutting the 10.5 inch blocks in quarters, I came up with around 7.25, not 7.5 and after sewing those into the Hourglass, my 13.5 inch block was still short and ended up as 13 inches, I wasn't able to cut those in 4.5 inch squares and had to trim a bit off -- so in the end, it is a 12 inch block, not 12.5. But it is still a beautiful block!!
Edited to add: Tartan on the board is the one who did the tute, check the tutorial's section.
Last edited by reeskylr; 06-30-2014 at 08:23 AM.