The stars really did align for this project. We found a custom sliding door that had been returned to Home Depot that was the exact height we needed AND we got it for cheap! However, we did have to build a door jam to center and anchor the sliding door into position. This was the most difficult part of the project and something I couldn't have done on my own. I thought a head, though, and waited until my talented carpenter dad was visiting so he could build the door jam for me.
The total out-of-pocket for this project was just over $200. The key to keeping it that cheap is use what you have already and enlist your carpenter family or friends to help you.
At some point I will build (and by I, I mean my Dad) some extra shelving to divide up the top two shelves and provide extra storage space. I am also thinking of putting under-shelf baskets in the space above the kegs. This will be a great place for me to keep my beer books and bar rags.