Finished the new double sided table runner.
This was really frustrating to do as the side strips and sashiko fabric stretched causing some puckers in the top stitching and rolling at the ends initially. Eventually fixed it by doing some handstitching to tuck an end seam in a bit further to compensate for sashiko stretch, redoing the top stitching using the walking foot, and a quick cold wash/steam press blocking/air dry combo to set everything into a uniform shape.