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Welcome to SMF , Glenn!
I don't have any input on firebox size, but the size of the door can be any size you want it to be. My advice is grab the biggest damn piece of meat you'd even consider smoking and hold it up to it and see if it would even fit in there. If it's small and doesn't come...
First of all; Welcome to SMF!!
As for the rest, you might want to copy/paste your conundrum in a new post to the Smoker Builds Section for a wider audience on the subject as this is just an introductory section of the forum.
Dangit gary, you know how to get a stomach growling in the morning...
Back bacon (CB) makes the best sammies. Love it piled high in between two pieces of french toast with maple syrup to dip. I call it the French Canadian Dip.
That does it. I'm getting some of this cured this weekend.