I used sketch up 8 but saved it as version 7. I imported it to 3ds max 2011 (max 2011 imports sketch up version 7). I exported it to mdl files > convert the mdl to mdx. Did some edits with the size and texture mapping in mdlvis > calculated the extents in magos model editor > saved the model > tested the model in WE. Nice and Working...
All in all, I used 4 software for the task.
EIDT
5 software including the simple mdl-mdx converter.