re: Urn #2

3/8 is plenty thick to float a top or bottom in a dado. Make the dado 3/16 or even a full quarter thick, and just be gentle when you’re assembling things. Once it’s together, the parts reinforce each other.

I typically don't glue wood panels, other than just a dab in the center of the ends. My worry was if the "thin wall" at the outside of the groove still be strong enough. From the consensus, sounds like it should be. I typically am an "over builder" so these fine measures feel uncomfortable (new territory).  

And I need to figure out accurately doing an inlay as he wants a cross on the top. I purchased a router inlay kit so time to practice with that.  Learning a lot with these projects!