Sorry for the delayed replies guys, was out of town...
Kind of hard to get a good picture of the space. It's not overly large. It's sort of a triangle maybe 3 feet on a side. Just drywall around it. It does go all the way to the ceiling so it's 7 ft tall.
Assuming it could be insulated...
I'm dying to ditch the bottles. But my place really doesn't have room for a keezer or kegerator. A solution occurred to me. There is a space next to the pantry (storage space inside the wall) that is not use.
I'm basically wondering what it would take to convert this space into a functional...
Regarding sanitizing cold brewed coffee, check out this link. Boil it with your priming sugar.
http://www.madalchemist.com/archives/experiment-boiling-cold-brewed-coffee/
Seems legit. I'm going to do this for a stout I'm brewing. Not taking any chances on letting bugs in.