Sorry for the delay with pictures, fellas. I haven't busted this thing out since my last batch of oysters, and that's been a good while.

Front view, kinda gives you an idea about the size of the box, which is about 3.5x18x2. I used PVC fittings to jury-rig the steam pipe to the wallpaper steamer.

Inside the box, nothing high tech here. PVC steam spreader, a closet shelving unit I cut to fit with a Dremel, and some jars to hold it up. I was using wooden dowels, but they didn't do well in the high temps and I got some breakage, so the little nubs you see on the front of the box are all that remains. Now they basically act as corks, and whenever temps get to high I pull one out on either side and it'll keep the temps from going any higher. If I need the box to cool down quick, it's as easy as opening the box and letting steam out.
Now what I'm thinking of doing is just making a rack out of 2x1 furring strip to fit around the inside, and then use nails to put the bottles on. That way I can take out the wire shelving and just put bottles upsidedown on the rack, which would sit on the jars. Turn this sucker on for an hour or two, and I think it'll do the job just fine....