I'd make 2 flying geese units and trim the top off one of them. You would loose a little bit of fabric, but I think this would be the easiest method. Looks like about half the height, but I would make the 2 units lay one down and put the other one on top adjusting the position until it looks right to you. Mark where the edge of the top unit touches the bottom one, add a 1/4" seam allowance and trim the excess.