I just wired over 26 Dz1000 machines and lessons learned: My machines were a few years older, but here are some hints:
1) Pre- Tin your wires going in an out of the machine. Will save you some electrical contact frustration.
2) Pre test each machine before you install. Even if they are new.
3) Use the junction idea above below the table. Chances are you will have to service these machines
4) Solder your wires to the controller, and use the junction under the table, or a contact strip.
5) You can change the LED lights on the machine with ease, not so on the controller.
6) If you have a limit switch go on one of these or a small broken wire, best to just save it for parts. Tried to take one apart and it was like the rattle snake in the can... surprise... yeah, it not going back together.
7) Some times I get a screamer. A motor and gear that will loose contact from each other. I have been very lucky in sometimes pressing down on the top housing firmly with my thumb and they will re-engage.
8) I change the switch machine attachment screws to a lower profile / smaller screw. This will prevent Lionel 0-8-0 scale locomotives and Atlas passenger cars from catching on them.
Most of the time these are very reliable, just have a few spares just in case one goes during your next operating session.