Hey @Ketchup - the method I described today at the field only applies to my workflow (3D model in sketchup, unfold using a plugin, export to a .DXF file, open in DoubleCAD XT, print to CutePDF to make a PDF file). If you are going to 2D model your plans then you should probably use Inkscape. If I understand correctly, you can save the Inkscape drawing directly as a PDF file. My workflow is complicated just because I am doing the 3D modelling in Sketchup.
DamoRC
DamoRC