Sorry guys I didnt realize there had been new posts to this thread, I missed them altogether.
As far as screwing the staves or not, that is up to you. I did that at first with mine (because I saw it done) but soon realized that I needed to knock down the bands to keep a tight seal. Since my barrel was so big I could not use water to keep it tight. If I could go back and do it again I would
1. Use a regular sized barrel, not drill the bands to the staves and use water after every few cooks to keep it tight. I might even use a water bowl inside like a WSM to keep it as moist as possible when cooking.
2. If that did not work and it still got gaps between the staves I'd buy a hot plate and make it an electric cold smoker. I have an extra barrel here at the house, I'm flirting with the idea!