No the cases are not assembled. They're 12" deep. How did Chris cut the second row of holes if he referenced off of the same end that he cut the first row? Obviously, he used another piece of stock to support the rails but I just wonder how to get the 2 roles of holes to line up perfectly. I hope this makes sense.
I see that, unfortunately, Chris has a restricted status here so he can not answer himself. I found him in the other forum and sent him a PM over there, however. That's too bad we have to use these kind of work arounds. It log-jams info.