Building an XL table

Hello!

I'll post some follow up pics of my progress and completion (gotta have it done before the Seahawks play this weekend!!!) but I have a quick question:

I'm building a table for my XL egg and I need to know how important it is to have the airflow space between the bottom of the egg and the stone underneath it. I've seen tables with and without the airflow space. Any thoughts?

Thanks!

Kris