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.
My planer blasts shavings all over the shop floor. I decided to make my own dust chute from 4-in. PVC sewer pipe (which has thinner walls than regular Schedule 40 pipe) and a couple caps. I cut a slit in the pipe and used a heat gun to soften the plastic. That allowed me to open the slit. (Heating PVC releases fumes; ventilation is critical.) I then drilled holes in the flap and screwed it to the planer housing. Finally, I cut a 2-1/2- in. hole in one of the end caps to accept my shop vacuum hose. Works great! — Luis Arce. Here’s what else you can do with PVC pipe.
With an orbital sander and good sandpaper you can smooth wood evenly and easily with first-class results. When flush-sanding solid edge-banding, draw a squiggly line across the joint before sanding. The edge-banding will be slightly proud of the plywood veneer, so the pencil marks provide a visual aid to make sure that you’re sanding flat, and that you don’t sand through the plywood’s veneer. As you go, you can also test for a smooth, level transition by gently scraping your fingernails against the transition. If it’s smooth, your fingers will not catch on the seam between the two pieces
This plan is probably the easiest plan ever added in the list. The one who is working on this project, don’t need any professional skills but just knowing some basics of woodworking will be enough for this DIY. You will get step by step detailed process of this tutorial in the source linked tutorial. This tutorial will surely help you to build this plan quickly.