My procedure for converting a model:
1. Make one in Sketchup, making sure all the tubes are un-smoothed and explode all curves/edges when done. (as described in the tutorial)
2. Export as .kmz.
3. Unzip that file, and copy all the textures from the "images folder" to the "models" folder. I've also tried to copy the files in the root of the folder to the models folder.
4. Crosswalk import the .dae model in crosswalk.
5. ending up with no result
This is how the opened-up .kmz folder looks like:
Root (for example, tat_model)
-images (folder)
--texture[0-18].png (meaning there is a texture0.png, texture1.png etc.)
-models (folder)
--model (in this example, tat_model)
-doc.kml:






