Control Panel for the new layout

[Gary S]

...and where do the Legos come in..??

Now I get it!

Those are terminal blocks where the external wiring will connect to the internal wiring. Everything is color coded. Every particular wire will hav its own color, and will attach to the proper color terminal block. If you do the planning beforehand, the wiring becomes amazingly simple. All the blue wires connect together, the red, etc. And troubleshooting is easier, as are additions to the layout.