Ive got the same issue. Ive updated woo commerce and the ‘no shipping’ message has vanished. Ive tried this on several sites with different configurations and nothing works. Something the in newts update has caused the issue. Its a very bad user experience not to show there is an issue with shipping..
Yeah Ive taken a look at these but they only really cover the point and click modifications. Im guessing that some more CSS is needed to achieve control over the table on a more advanced scale for fonts, individual headers etc.