Lots of people want to know: how do I get my models from Google Sketchup into Unity 3D? The answer is very simple. And here it is.
First, you need a model. I found this cool model on the Google Sketchup 3D Warehouse. Ideally, you’d make your own, but you don’t have to. Also, make sure the model is in the center of your world. Meaning, zero on the x, y, and z coordinates.
Next, export it (File > Export > 3D Model). Note that this is in Sketchup FREE, not PRO. Save it in your assets folder in your Unity project.