@Argo: Podium (you can't find more easy render prog and free 500*500 ;) http://www.suplugins.com/
Absolutly no problem :) here no artistic result just test your file :)
Try with the 3ds file : I suggest to "clean" your model with a plug name "Cleanup" by Thomthom (erase coplaner face ...etc)
http://forums.sketchucation.com/viewtopic.php?f=323&t=22920&st=0&sk=t&sd=a&hilit=cleanup
(this erasing can be also to be made without plug at the Importation file/Options)

Then if you want (like me here:) made a red wall and lighting you must Edit Component then select any faces wanted and move cursors!
Your object here arrives with this stucture Component/Component... So you must Edit Component/Edit Component...
An easy method is select by Menu Windows / Outliner
Of course better is export from Moi in SKP ;)
Shadows asked in Sketchup with no Shadows you will obtain an another nature of render
Render 2 minutes 50 in a very old computer more than 7 years old! :)
Any regulates : biebel_settings.xml presets
Center your objects in the Sketchup Screen because Podium in free don't make any position refine
So any faces can be a light or/and a reflector :) ("box selecting line" means that I am in Edition of a Component)