Modular desktop shelf

This is a modular shelving unit designed for a 19mm thick and 23mm deep wooden board; the length is customizable. It features drawers of various sizes, ready for use with Gridfinity. I will be improving some details and adding drawers and shelves of different sizes later. This is one of my first projects and hasn't been tested yet, so I can't provide an assembly tutorial or guarantee that it's 100% perfect. Any feedback would be greatly appreciated.