Add your corners within the rectangles made by your walls.

Now as with the regular Leaf Knot, attach the loose ends around the outside of the walls. This will form a continuous border - there should be no loose ends, and the lines should wrap around the walls at the ends of the border.

Pick a place where the lines criss-cross, and erase it so one passes over the other. Erase the other criss-crosses so that the over/unders alternate. If you want to be notified via e-mail when new Tutorials are up and running, sign up here!