I should advise that disappearing hourglass is NOT easy to quilt, because the pieces end up mostly on the bias. I tried to straight line quilt it on my machine first and it just was not happening so I took it to the longarm, thinking that stretching it out on the frame would help. But nooooo... it was still a pain to keep the wrinkles from forming. I wonder if you can start out with bias cut squares for the DH and then you end up with on-grain blocks? Might experiment and try that, because it is such a cool block.