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.
Description: Ok you've been through Fundamentals Level 1, now let Bret take you one step further with your favorite hobby. During this class you will add to your basic skills by constructing a beautiful Shaker style plant stand. Solid wood table top and tapered legs will be incorporated into this project, teaching you skills needed for furniture making.