I have never done a drunkard's path block. So the That Quilt method helped me. However, I didn't like all the pins... got in my way. Where she removed the freezer paper, I left it on. Then pinned just the ends, squaring them with the sides of the inside piece. With the freezer paper still on, this curved the top piece stiffly sticking up. I then used a bead of Elmer's glue along the bottom seam allowance. With the freezer paper on, if you try to pull the two pieces flat as if they are already sewn, that lines the seam up just right. This is how it looks when glued.
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This is how it turned out
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