Labeling is a good idea, a diagram is important as well. I would also take photos from the underside that shows the wire locations as well.
If you plan on installing the layout EXACTLY as you have it now, then you should not have any issues. But often, we learn from previous layout design, that we want to change this or that.
I've saved wires from previous layouts, but only use a small percentage of the wire. It was more of a hassle for me to locate the correct size and length to reuse it. And I wanted to improve the way that I installed the new system.