Modular shelf system

This is just a very simple shelving system that I created to hang my hats since I had too much. I saw potential so I also designed the shelf to fit on the same wall mount. I plan to keep creating more attachments that fit on the shelf for various uses. I just used 3 long nails which fit perfectly and have been holding it up strong. I know it is very simple and there are probably better designs out there but I just wanted to share the designs I have made with my very limited CAD knowledge. I hope you enjoy it and thank you. :)