Sry Riccardo, but you did it false. If you take a look, for example, at Ians triangle (http://mocpages.com/moc.php/367190), you will notice, that the bar, which ends vertical to the top corner, should has a slope at the top, so you think that it is connected to the bar, which comes from left.
You know, what I mean? ;PP
But your photoart still great! ;)