Hi Pilou, yes currently styles are not exported to SKP format.

One reason for that was that I wasn't sure how they should be exported - SketchUp has a couple of different ways for assigning colors, there are both Layers and Materials.

I think with the previous discussion here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3790.16 it was resolved that Layers are not generally used in SketchUp so that styles should be exported as Materials. That's something that I will be trying to add in for MoI v3.

- Michael