Pit photos, and a question.

So I have been building this pit for about 5 months. I plan to have it powder coated, and it is currently sand blasted. Main chamber is 24''x 3'3" with a 3/8" wall thickness. My firebox is 18"x 3'2" with a 1/2" wall thickness. It is trimmed out with stainless flat bar as the flanging for the door which will be polished to a high shine. I designed everything on her. I am super proud of the hinges I designed, and spent forever rounding, and polishing. It is reverse flow, and last night proved it ran like a champ. Shooting a laser on the top of the fire box and getting a reading of nearly 400 degrees got me thinking of a warming box. If I were to put a warming box( I guess that is what they are called) above my fire box how hot could it get. Do they just warm or could pies be cooked in them? I would go flush with the sides of my firebox, and tie into my main chamber. Not sure how high I want to go. Looking for ideas, and advice.

It weighs around a 1000 lbs. The powder coating I am going to use is good for up to 1200 degrees F. Thinking Green Illiusion on the pit, Metallic black doors, and polish stainless trim. Thinking about doing the heat box flush with the sides of the fire box on all sides stopping just before my smoke stack in height, and 45ing the top corners. Double doors on the front. Same hinges same trim. Thoughts?

Cause it looks nice, and to keep smoke out of my face getting good air flow so no reason to change it.

Here is a link to the powder http://forrestpaint.com/uploads/images/stovebright/stovebrightcc300.pdf