I am installing some wainscotting in the bathroom. I am putting a cap molding on the wainscotting, and have come to an outside corner. What is the easiest way to ensure a good fit when the wall is not square. It seems as though a space is left behind the molding when I extend it enough to get a mitered joint. Also I have an outside corner molding coming up verticly to meet with the cap molding but there is a difference in the thickness of the two pieces, the corner molding sticks out beyond the bottom of the cap molding. Is there any way to join these without using an outside cap to cover the joints. Most of the caps I have seen are too large for the application.