Hi

I drew these quickly to demonstrate what I had in mind:

This one being the final idea:
Click image for larger version.  Name: Binding side.jpg  Views: 201  Size: 29.5 KB  ID: 4831

And mounting the binding roughly like this. 6mm binding with about 1mm above the top curve so that I could sand it to follow the curvature of the edge. Final width of the binding would be about 5mm. Or I just mount the 6mm in and sand the final edge. Just thought that it would be wise to leave at least some extra on top:
Click image for larger version.  Name: Binding mount.jpg  Views: 213  Size: 33.2 KB  ID: 4832

I hope this makes my thoughts more clear