Thank you, Bob, Dan, Andy!!
Bob, you are absolutely right; the builder always knows every flaw in his work. He has to decide if he will try to improve or if he can live with it. The baloon is a novel idea for hiding a seam. The imagination is the limit of how to hide any flaw.
Dan, I think your idea of the one time jig could work. I'll have to try it.
Andy, my forward thinking comes from the experience of doing too much backward thinking. I have gotten ahead of myself too many times on this layout.