Snce I am sewing on the diagonal, I can either choose to do a y seam here or take off the one piece and keep it straight all the way, it usually depends on my mood what I will choose to do, if I had left the sides with the contour it wouldn't be an issue, everything would just line up, and at the moment I am missing a piece for my edges until I figure out what color my boarder will be, which at this point I am totally clueless and don't really need to worry about it until I am ready to sew my strips together.