Patrick never shows us how to finish the ends.
Sharon has the triangle, but why do you need extra fabric sticking off the edge? Just fold the end down so that the top end of the binding is even with the side raw edge.
Jenny Doan has a pretty good way of joining ends in her block magazine.
When you press the triangle in the beginning of the binding, the end needs to overlap just to the bottom of that triangle. No rulers needed. Cut it off there. No matter how wide the binding strip is, that measurement is there at the bottom of the triangle.