Well, currently our tools are only for blender. It's a lot of work and we are a small team, we don't have time to code another exporter for Google SketchUp.
You can use Google SketchUp to model a track and when it's finished, you export your objects in .obj and re import them into blender. But in my opinion, it's not a good idea.
If you want to create a track I suggest you to learn how to use blender, but I know it's difficult
