Bingowings said:
One of the script variations with the Imperial city also had the two Death Stars being built around the forest moon of the capital world (bringing the final fight nearer to the centre of the web).

But in that version the Emperor's throne room was deep underground and surrounded by lava.

I've read that script - his Throne Room is deep in the bowels of the Imperial Capital - Had Abbadon. The spirits of Yoda and Obi-Wan also help Luke defeat the Emperor and Vader throws Palpatine into the lava and tries to throw himself in it as well.