Convert DWG file to DXF format and vise versa. Copy and paste these values into the kml file you exported from Google Earth and use File Open to merge it in GE. Convert between DWG, DXF, PDF, DWF and various image formats without the need of AutoCAD. Determine an appropriate offset and scaling value then use the Excel concatenate command to create the coordinates for the kml file. I find the Excel text to columns feature handy for this. You can use the Export IGS or if simple 2D geometry the list command to generate a list of x y points you can convert to lat/long with Excel. This should give you an idea of the format you need for creating your own kml file. I would start by creating a polygon of known size in Google Earth in the area of interest and saving it as a kml file. You would need to convert the AutoCAD coordinates to Lat/Long decimal degrees. It would be an interesting exercise to create a KML file from the line coordinates in your AutoCAD drawing.
You may need the $500 Sketchup Pro version. Did you consider importing the dwg file into Sketchup and then use Sketchup to position it in Google Earth? I don't believe the import features are included in the free version.
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