Thanks Al. After my first test burn, and reading some of the posts in this forum, I cut a 4"x8" fresh air inlet down low on the back of the box. I put an adjustable floor register cover on it so I could damper it as needed. I did another test burn, and this time I borrowed an ET-732 from my neighbor.
At one point, I got the smoker up around 245F, but that was with what I'd call a "full" fire in my stove. Also, the temp would fall pretty rapidly back to around 190F if I let the fire settle even a little.
I'm wondering if I should try to add some fire bricks to the inside bottom to maybe help hold a more even temp.
Also, I was getting about as much smoke out of my "fresh air inlet" as I was my vent. It was a pretty windy day though, so maybe that was pushing the air/smoke around in the box.
Suggestions?