re: Leaf Box

Nice job on that Foto! The sanding on the lid is impeccable!

I've made the inlay style cutting boards like that before but went a bit different. Hate using the router collars, even on my router table so I made a template for one side of the curve and taped that down to the stock. Then with a bearing-on-the-shaft hinge mortise bit (3/8 diameter, 3/8" depth or something with a diameter equal to the width of the intended inlay).
  I raised the bit to follow the template (template side down on the table) and cut a 3/8" wide slot in the wood about 1/4" deep. If you use thicker template stock you can use a longer template bit if you don't have a mortise bit.
Cut down the slot center line with a band saw then return to the router table and use whatever template bit to have its bearing follow the "clean" edge left by the initial routing. 
This makes for a perfect fit when the inlay is added and clamped in place. If the curve isn't too severe, you can get away with a thinner inlay and still not have gaps.
I found that I had to make the inlay from 1/8" strips and laminate them together to allow them to be bent before gluing up the whole assembly.