You reload your Models with SKP format exported from Moi inside Google Sketchup8 ;)

Then export it in special format with the Ogre SKetchup 8 exporter http://www.openspace3d.com/downloads/Sketchup%20exporter%20for%20Ogre
for have at the end an "ogre" format compatible with OpenSOurce3D !
here the tut ;)
http://www.youtube.com/watch?v=uwWzwEOgyu4