I added the schematic in the Files area. I also made two quick renders of the layout files. One of the layout files is including the connector and the other one is without.
As you noticed, it is not so much of an electronic design, excepting the fact that I redrew the diagram with my own connectors, reverse polarity protection diode and the LED light. In fact, I believe there are similar products on the market at this time. After all, this simple schematic is like connecting an LM317 to a couple of capacitors. It's only requiring basic skills. This simple diagram is proposed several times in different configurations in the datasheet of the component. It is a simple circuit but it will work perfectly with my design.