Don't know a thing about it but I know Alton Brown did a Good Eats episode on it. The episode was called "Scrap Iron Chef" and he made his cold smoker out of an old fridge. I'm not that handy so I didn't pay much attention but maybe you could fing the bittorrent for that episode and get some ideas...
Wait! Bigmista wrote a cookbook?
Then burn the entire ram on the altar. It is a burnt offering
to the LORD, a pleasing aroma, a food offering presented to the LORD.
God loves BBQ!
Bigmista Custom Spicewine Trailer - Olivia J. PIMA
Large and Medium Spicewines
Weber Ranch Kettle - E.T.