[Google Earth] SketchUp file exports KML from GE with missing data to Google Maps

Hi, I have been following a logical sequence to view a geo located sketchup layout in 2D from Google Maps.

Firstly I create the geolocated Sketchup layout in 2D, I then preview in Google Earth, save that as a KML file and then import as a layer into Google Maps.

Somehow the KML gets corrupted and when checked in KML validators, shows that there is information missing.

I just do not know how to get around this. I have tried to find converter to go from dxf to kml, but I still end up with the either it showing in Google Maps as a load of lines accross the whole globe or it just shows a logo saying model.

Can anyone shed any light on this, or of a way to do it.

Much appreciated, Andy