Are you just relying on heat from the pit into the warming box? Looks like you had the stone and top plat positioned to sandwich the damper opening from the main cooking chamber.
Shirley Fabrication Offset Awesome Pit
Backwoods G2 Party & G2 Chubby
Big Green Egg XL
Weber 18.5 Kettle
"Tenacious Q" Competition Team
Follow Tenacious Q on Facebook!!