There’s nine more drawers that I didn’t take interior pictures of because it’s just generic stuff. But I will go through the contents for you. Top to bottom in the left column is a drawer for manuals, a drawer for every letter that I have received from all of you out there, and a drawer for my electrical tools and supplies. Top to bottom in the center column is a drawer for miscellaneous hand tools that are more general household and carpentry related such as pry bars, putty knives, and drywall tools, a drawer for hammers, mallets and squares, and a drawer for all of my hand held cutting tools like handsaws, knives, and chisels. Top to bottom in the third column is a drawer for all types of brushes, a drawer for all of my sanding tools and supplies, and a drawer for all of my router bits and attachments.
The shelf in the first picture is made of red oak plywood. You can choose the wood type, color and design as you like for your project. In case if you need more help understanding this project, you can refer the source link below. It discusses various items used, steps and tips and personal experience of the author who personally built a Zigzag shelf.