I must confess that i had added the big plate after my first post here. So the rendering do look better now, and besides, everything is not supposed to be white, so im confident in making some real pics.

But should have added some bluish arealight of sorts.
I Could also have done this in FinalGathering, but i just dont have the patience to wait for the slow thing.

But I'll try to combine GI and FG, and get back to this post with a more exiting picture.