I thnk this is what Zimm is suggesting. I'm not a woodworker, but unless this is too difficult or not feasible, IMHO I think mitering the ends of all four pieces would look good, particularly with the curved top edge. It would also echo the mitered corners of the table top.

P.S. That table is really nice.

Jack

"People generally quarrel because they cannot argue." - G. K. Chesterton