The door/step in the man-garage is an addition so i cast in a 2" pipe that serves as conduit for the co2 and beer lines (i should have made it 3" to account for insulation). I picked up a narrow (27" wide) commercial cooler off craigslist (True GDM-23) and popped a hole in the bottom for the lines, the fridge is capable of holding 10 corny kegs.
In the mini-fridge there is a plastic (key!) 2gal reservoir and a computer-CPU cooler pump (Swiftech MCP350 - very quiet!) which circulates RV/food grade glycol between the two fridges as well as the cooling plates inside the tower (an ebay score). I originally used an aluminum reservoir but within a couple of weeks it corroded significantly, i looked for an inexpensive stainless container but nothing came up in the time frame i needed it. On the left wall/bottom of the commercial fridge you can see the pink fluid in the line, the positioning of the line can also tell me if the fluid runs out, etc.
The 20lb CO2 is on top of the tall fridge (and chained up), a freebie regulator drops pressure to ~25psi (not necessary but it easily adds a valve for tank switching and also lets me mount the "beer pressure" regs in a convenient place away from the tank). The one thing that i spent "real" cash on is the secondary regulator bank (Micromatic 1164). One reg for the mini-fridge, one for carbing, and two for the tall fridge to serve at different pressures.
And i labeled the heck out of everything to reduce confusion - there are 9 co2 lines, 8 beer lines, 1+4 regs, and 3 manifolds.
To do list:
1) strengthening the rack in the tall fridge. It doesn't look like it can handle 5 full kegs.
2) Add another manifold for an expanded carbing station.
