SketchUp Tutorial: How to make a chair in SketchUp
Creating chair in sketchup
SketchUp Tutorial: School chair model
Here you can see my own approach modeling this curvy school chair and hopefully you can use some of these tricks in some of your own modeling. This model is fully downloadable at my 3D Warehouse profile and it's not the only one there. Here is the link: https://3dwarehouse.sketchup.com/user/f8ec96d1-076e-470a-81fe-c847265cc67b/SketchUp-For-Everything