What I would do....Follow the pattern on this one but starch it really well before carefully cutting....no steam since that may distort... Any wonky alignment issues on edge should be absorbed in seam allowance. Also, attempt to not stretch fabric when piecing and sewing....keep it stiff and if you have to make pieces a bit bigger, you can just trim your piecing as you go. I've done that on bias piecing and it works for me. Takes longer but end result is better.