I was shaking my head until the last part. I would probably not leave a job "incomplete" with unlabeled wires regardless of whether I expected to trim or final the project. But your idea of a wire schedule with a numbering system that YOU can refer too is smart. You could always try and sell the info to the client if he decided to use someone else or try and DIY after you roughed it in.

I can understand the frustration of spending the time designing and roughing in a house that you never get to go back and finish. But if you did it right, you got paid for the design work and made a profit on the rough-in. I really think a rough-in should be treated as a complete project. You finish it like you would any other project. If you played your cards right, you will get the call back....and if you do not, move on.