I'd do a single door with the hinge on the side- easier to build and no problems w/ it being too heavy to lift. Also, I'd put the air inlet on the door too. If for whatever reason you ever decide to change it- just have to fabricate a new door instead of the whole fire-box. JMHO
"Eating 'Que isn't making me fat- it's the beer I drink while lounging by the pit."