@saltycake I don't know if there's a video, but I can try to make a tutorial. I just need time to make another bookmark so I can take photos! But it's really similar to regular triangle ends... only on alphas, it helps to rotate the bracelet so the bottom edge is sideways, then just picture the top half like it's part of the triangle edge of a normal bracelet and make your fb/bf knots like normal. Then flip it to do the other half so it meets in the middle, and tie together with square knots.
@saltycake first I taped down the base strings straight across, knotted the pattern, then finished similar to triangle ends on normal patterns. I held the strings perpendicular to keep the knots very close to the pattern. Then I removed the tape and finished the top end last.