Brian,
I designed the box using Aspire software and did the initial cutting on a ShopSabre23 CNC machine. I first cut the eight maple ellipses, then cut the corresponding holes in the walnut. The first time I cut the walnut the holes were too small, so I increased the size of the holes by .015". This resulted in enough clearance for the ellipses (good tight fit).

I built a “Wedgie sled:” :http://www.segeasy.com/wedgies.htm
to cut the segments. The Wedgie sled is a great idea, the sled works very well.

Thanks for all the comments.
Roger

Roger