I'm not sure if anyone else has found this or not, but there is a throne room in BtS. Or at least it's set up for one, because I found all the art for an Egyptian styled throne room. It looks as though they started making it than gave up when they realised it would be too much work (i.e making one for every single civ).
Hopefully someone can look at the nif file and the sdk to see if they can mod it in somehow. You can see where to find the file at the top of the screenshot.

Hopefully someone can look at the nif file and the sdk to see if they can mod it in somehow. You can see where to find the file at the top of the screenshot.
