I would first cut the stock in the oval shape desired. Then I would use a router mounted on a bridge with a mortising bit and some curved templates/tracks for the router bridge to follow. I would design the bridge and curved tracks so the router could make a pass from the top center area down to the edge of the part, then rotate the part slightly, re-clamp and make another pass, repeating this until the work had been routed all the way around. It will likely take some sanding to clean the part up, but it should make the curve that you want. I've used a router bridge before, but never for something quite like this.
It will be interesting to see what others come up with. Harry, how would you do this?
Last edited by CharleyL; 01-31-2011 at 11:28 AM.