I will SITD sashing from the center of the quilt out to the edge. Be extra careful where lines cross over as that is where you can get pleats. If I am doing an all over meander, I do not SITD . If you are a beginner and you SITD the sashing, choose a design for inside the block that is central and does not go right up to the SITD. That way if you have a little extra material in the block you won't get pleats where it is against the SITD.