Working on the next round. I am doing it mirror left and right, so fitting one side and then cutting the other to match. The cornerstones go in the major points, and they overlap the next border. Will have to wait until that one is on to figure out what size they need to be. This is ending up a lot larger than I was after, but that will just mean I don't have to put as many outside borders on to get to the finish. And that is not really a bad thing. . .