Google Sketch can import dxf
take the version 6 it's free
http://www.brothersoft.com/downloads/sketchup.html

or you can also export directly from Moi in skp format (sketchup)
And inside sketchup ask to show only structure (SelectionToy by Thomthom)
http://forums.sketchucation.com/viewtopic.php?t=14975