Gentlemen, let's nip this one in the bud here and now.
Fabrico, for the record, I don't know whether or not there's any merit to your claim that the work is something you did but which was pirated. The problem here is two fold.
One: The sketchup program used is fairly common so just about anybody can use it.
Two: Since the light fixture is something which can only be shown so many ways, it shouldn't be surprising that different people working independantly with the same program and the same information would get similar results.
Might I suggest that in the future, if you post any of your own work on-line, you put some kind of identifying watermark on it so if it's pirated, you'll have the proof.