Larger collar, with insulation.
Add a fan or two inside. I ahve a boatload of computer fans. One or two should do the trick.
1 tap for every keg. Sooner or later you'll have more beer styles than taps and that's no fun!
Shelf for yeast slants. I run my keez at 38*, so it's perfect for slants. Freeing up some freezer space in the kitchen will win points with the lady!
CO2 splitters. I'm using the ones from harbor freight. I have three secondary regs, and they'll all get double fittings. Also, out of my secondary bank, on the high pressure side, I have a 5' piece of air line with a disconnect on it. That way I have a free hose for purging, and sealing kegs when needed. It also works for force carbing.
More Damp rid. I have the small container now and constantly get puddles in the bottom of the keez. I'm hoping the fans help with this as well.
Different seal than I have now. Right now it's the 1/2" vinyl door seal from HD. I'm looking for something a bit thicker. I might glue the edges too. Right now the edges of the seal are just mitred, and there's a slight gap.
Things I did right, that I wouldn't change for the world:
Stainless shanks and nuts. Anything that touches the beer is stainless. Buy it once and it's good for years.
Perlick Taps. No drips, and they're a breeze to open, even after a few days of sitting.
Two CO2 tanks. Nothing like running out of gas on a Sunday afternoon...
The high pressure (30PSI) disconnect on a long hose. It's really useful!
B