I built a cabinet out of old wood paneling that used to be in my living room I drilled a bunch of ~1.5" holes in the bottom, and then layered a couple sheets of aluminum foil over the outside of the bottom, to protect it from the heat of the smoker. After the first tests, I had to drill a few more holes, but otherwise it works great! Only current downside is that it's very hard to refill the wood chunk bowl, so you have to make sure you load it up enough for your full smoke run at the beginning (which isn't a huge issue, really).
Here are a couple pics of the setup in action:
and here are some deer and hog sausages I made and smoked (for about 8 hours at 120*F)
Also on that topic, here is the sausage stuffing plunger I made to replace the one that came with my kitchenaid meat grinder: