Rdann nailed it. It was made for 3 - 1/2 barrel kegs.
I'm thinking that I'm going to keep it at 3 taps for now. In a perfect world, I'd like to have 1/3 set up for bottles, 1/3 for 3 corny's, and 1/3 for a lagering chamber. I know I'll need to segment off the lagering chamber, and allow it...