Skalp has created material libraries which you can download for FREE from the SketchUp 3D Warehouse.
Place these components in your model or your template and you have access to all the hatchings inside Skalp.
All materials can be edited with the Skalp Pattern Designer. You can change the size, the line and background color, and the line weight or you can use it to create your own material.
When exporting your Skalp section to dxf, the patterns will be replaced by autocad pattern definitions.