Vaderios said:

Even i found the idea of the throne room is in the dish or near it.. we concluded that this could cause uber perspective problems.. OR the tower pops up in different angle from the round dish and then all being solved with a much more interesting background ;)

Rogue Leader Replied:

As for the Emperor thrown room on the dish... Technically it makes sense considering there's a huge shaft that leads down to the reactor and super laser leads to the hyper matter reactor... Either that or it's on the Northern most pole where the original exhaust port was located... Instead of proton torps, use a Sith Lord. ;)

I may be posting this and you guys may be suggesting where the throne room COULD be in a new edit and already know of this shot, but this is it on the surface (North Pole sounds probable)