I have been asked to build a mission style coffee table. It's kind of similar in design to this one:
It will be made out of walnut instead of oak.
My question is about the lower shelf. I understand how to attach the top to account for wood movement (figure 8's, or slots, etc.).
However, I'm not sure about the lower shelf.

I would like to use solid wood throughout, so ply is out of the question. From looking at various designs out there it seems as most just have a butt joint possibly with M&T or dowels. Wouldn't wood movement in the lower shelf also be a concern?
Thanks for any tips,
J