What sort of designs should I be using SketchUp for with Aspire and VCarve?
Sketchup and the Aspire/VCarve Pro Vector importer is designed to allow you to work smoothly with flat panel designs, which will allow you to visualise the final product before having the components pulled apart and made ready for cutting.
This will turn a 3D models edges into vector lines ready for you to assign toolpaths to.
Certain design aspects need to be considered in your Sketchup design to allow for easy importing, such as component naming and Layer ordering. These are covered in both the help guide under the Help Menu, and in other FAQ pages.