Thank you for all your advice. I've got the thing on the floor and I'm deciding on my next move. I forgot that the edges were all on the bias. And no doubt the stretch is worse now for all the stitch ripping. I think I'll add a couple of inches of border and then the points. Oh no! I wonder if I got enough fabric. This is turning into quite the project. Meanwhile I had fun practicing machine applique last night, at least!