All wood workers got a question

[Shecallsmemaster]

What do you guys think of this. I drew a ruff sketch of how I plan to attatch the bed rails to the bed post. What I plan to do is drill a hole through the 4x4 into the rail then use the router and make a slot in the rail and push a square nut into it. I also plan to use the traditional style bed rail connections along with this.