(20"x40" Cook Chamber 1/4 thick & 20"x20" Firebox 3/8 thick) We build reverse flow or traditional flow offset smokers. Reverse is more popular. Comes with 3/8 thick firebox with grill lid and 4 steel wheels as standard $3,200 plus tax For Flat Free Mower Wheels Add $185, Grease Valve $25, Fold Down Shelf $65 For insulated firebox add $600, Cover $245 Stainless racks $700, Stainless top shelves $700, Insulated Gravity Feed Firebox $1,000 (must get larger pneumatic tires for weight) Adapter for BBQ Guru $95