I just saw the barrel in the other thread - looks awesome! I found this as I actually was wondering if brett would work in an RIS, and now I know. I got the idea when I found out how much cherry flavor Wyeast's BrettL throws is you handle it well, and thought it might be an interesting way to make a big "cherry" stout, which the fiancee loves.
In any case, I think I'll have to try a variation on this at some point soon. It's getting a bit warm for big beers now, considering my lack of easy temp control, but come autumn...this is gonna get brewed!