Lot of stuff to look at there. Thanks. You guys are all a great help.
At your recommendation, Angus, I just ordered a bunch of different colored heat shrink.
I don't think I will be setting up end stops/homing switches just yet, but I'm glad you brought that up. I may run a length of hookup wire running through the drag chain, and tie or tape it off at the ends. That way if/when I do get around to adding stops, I have a way to pull the wire through.
I bought my electronics separately, an have those tested and ready to go, so at least there's that. Just need some connectors to more permanently affix the stepper wires to the control board.
Having built and rebuilt my small 3d printer several times, and with all the great advice I am getting here, hopefully it will not go to badly when assembly day comes.