How can I get the best results with the SketchUp Vector import?
If possible, take your Sketchup design and lay out the components flat with the pieces orientated as if you were laying them out to cut. This will ensure that when they are imported, the vectors are exactly where you want them to be.
When working with layers it is important to ensure that all parts of the element you are working with exist on the correct layer.
Due to the nature of Sketchups layers system, it is easy to spread a model over multiple layers, which will make importing it more difficult.
For more detail, please read this guide.