Next Project - Music Box

I’m going to try and enter my next project into the wood joinery contest. I’m going to try and modify the Rockler music box plan to satisfy the wood joinery requirements. I think the challenge is going to be the sides. So I’m looking for ideas on how to joint the sides. They call for simple miter joints but that won’t work for the wood joinery contest. Please comment with any ideas.

http://images.rockler.com/rockler/images/41898-md.jpg

This picture shows a glass front but I’m going to make the version with solid front and sides and a frame and panel top.

Thanks,

-- Che.