Ran across these plans and they seem doable. Just want to make sure that they won't burn my house down.
http://thelowcountrylady.blogspot.com/2016/03/big-green-egg-concrete-top-table-plans.html
http://thelowcountrylady.blogspot.com/2016/03/big-green-egg-concrete-top-table-plans.html