Haha. Sorry I've been away for a bit, my parents came in to town, and I've been busy with other things as well!
Thanks for the ideas, I still have time to figure this out, but I'd like to have a game plan.
Valves are an interesting idea, and actually relatively easy to institute once I change out the rest of my tubing to 3/8'' OD and just use john guest fittings. There are some relatively cheap 3/8'' poly valves (not sure if they come in acetal or not, I'll have to look in to that). This would be an annoyance though, as I would have to go in to the walk-in and look for all 14 to turn off. What would be crazy would be to have solenoid valves wired to a keyed lock, and use a key to turn the solenoids to on or off. I do have electricity in the walk-in that I could use for that, but I don't want to even look at the cost of food grade solenoid valves.
Ken, yes, I do have right around 100 kegs now, with about 24 or so empty, waiting to be cleaned. That is something I procrastinate on, and my stack of kegs to clean always seems to grow.
I actually don't drink that quickly, and there are many kegs that are many years old at this point. This includes meads, ciders, and my big beers, which I might have on tap for many many years in some cases. Even beers that don't age well, I will keep until they start turning, and then either forget about them in the walk-in, or dump them.
This is one reason why I've moved back down to 5 gallon batches - by the time I finished the first keg of a 10 gallon batch, the second keg was typically already past its prime.
I am still preferring the idea of the box cover, but I would need to figure out exactly how to build it and lock it for when I need to, without it looking really tacky, and difficult to position.
I also still need to figure out how to secure my scotch collection in addition to the rest of the liquor. Right now we are using an IKEA wide shelf with sliding glass doors, but we use it for our glassware and other big plates. I bought a sliding glass door lock, but it is too small to fit on the doors, and it would be a pain to have to unlock and relock every time we wanted a glass or one of those plates. I think we need a separate true liquor cabinet that we can lock, but it has to be big enough (I have 21 bottles of scotch right now, plus the other alcohol, so it needs to be pretty substantial), yet not be too much in the way in the kitchen. I might end up getting two liquor cabinets - one to store my scotch in the basement in the beer room, and then another one upstairs in the kitchen for the mixed drink alcohol.