Hidden joint spline box

I might (empasis might) have a how-to magazine article in my future so I decided to do a practice run tonight to iron out some of the kinks. 

I grabbed a piece of Alaskan Yellow Cedar from a local craft store and went to work tonight. 

I'm going to save the details and the step by step for the article.  I'm not sure the Alaskan Cedar is the best choice of wood but it's not the worst either.