I don't think you will have a lot of trouble as it is well done. I only saw two areas where there's a bit of wobble and definitely not enough to throw the top off. When you add the border/sashing, make sure to use the measurement across the middle of the top (OR measure across the middle, and close to each edge, then average those three measurements) and cut to that length. I would mark the center and at least the quarter points on both the sashing and the top with pins so you have spots to better align the pieces. When you have any "extra" to distribute, it is better to distribute it evenly.