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.
This simple jig makes laying out circles a breeze. Drill a 1/8-in. hole through every inch mark on a ruler or yard-stick. To draw a circle, place a pin through the number “1” into the center of your board. Add 1 in. to the radius of the circle you wish to draw, and insert a pencil into this number. Using the pin as a pivot, rotate the pencil to mark the circle. — Edwin Constantino. How to Cut Curves in Wood
This is one of those things that you never know you need unless you have one. This amazing wooden sofa sleeve works perfectly on either or both sides of a sofa set. It gives your sofa a nice look. The sleeve can also be modified to include a cup holder, mobile holder, etc. You can easily find this item on any online furniture store, but an even better idea is to build one. This way, you can make a sofa sleeve design that you actually like and make space for cup and other things.
Tired of waiting for finish to dry on one side before finishing the other side? You can purchase standoffs, but it’s also really easy to make them yourself. Simply drive 2-in. drywall screws through 2-in. x 2-in. squares of 3/4-in. thick stock. The screw points will leave a divot in the finish that can be touched up later, but I always let the back side of my project rest on the screws while the finish dries. — Matt Boley. Plus: Check out these 32 other handy hints for frugal shop rats.