That's right, I ticked two-sided because the box was composed of basically 4 planes, but now it's thicker, I completely forgot about that 8)
About the item version, well it is supposed to be used as an item ^^ Maybe you mean like Warcraft items and make it rotate? That was too "cartoonesque" for my map, but I can do it if you really need it.
Edit : thanks for the double side tip, that was basically the issue with this model, I'll work on that.