Links:
[1] http://www.samsvojmajstor.com/portal/forums/uradi-sam/razno/za-projektovanje-besplatni-program#comment-388505
[2] http://www.samsvojmajstor.com/portal/users/granicar
[3] http://sketchup.google.it/download/
[4] http://www.samsvojmajstor.com/portal/forums/uradi-sam/razno
http://sketchup.google.it/download/ [3]