they model it in sketch up then export it as an obj and then import into blender or something then export it as dts
Where do i get the dts exporting for Sketchup
Google sketchup doesn't come with an obj exporter
Start sketchup 8 > Make your box of awesomeness (awesomeness is required.) > File > Export > 3d model > OBJ file (*.obj) > ??? > Profit!
That is because you need the Professional version of SketchUp ($499) to get the .3ds and .obj exporters.
i See (*.dae) and (*.kmz) and im using Sketchup 8
Click HERE hope this helps. :)
Milkshape has a .dae importer.