Mitered trim and wood movement

Yes you will need to be concerned about movement. If you totally surround a board with “trim”, the interior board needs to float inside that trim. Otherwise the inside board will push the joints apart.

-- http://theinquisitivewoodworker.com/

You could make a breadboard edge. Here is a guy doing exactly what you want to do.

http://www.binkyswoodworking.com/BreadboardEdge.html

-- Gary, East TX -- The longest journey begins with a single step.

That’s an interesting link. I think he only added trim to 3 sides, and expects the back edge to show the results of the swelling and contracting. I still feel if you wrap all for sides, the miters will pop at sometime. Unless your center board is something stable like plywood.

-- http://theinquisitivewoodworker.com/