Thought I'd share how we 'built in' our 500 smoker a few years ago in our outdoor kitchen.. Wasn't a lot of info anywhere so we had to experiment a little, but it works out great.
A side wall has hidden hinges and the whole wall rotates for maintenance and access to drip pot underneath. In a back room, another secret door discussed as a shelf unit is a double door access to the hopper and ash door.
A local kitchen fab shop created the shroud around the surround of the smoker.