( :{)) I was taking wild guesses. I don't know if GL had developed the Jedi duo and clones before '77. The twins might have been projected then, as well.

I'm sorta stuck. I'm trying to remember the choreography of the ROTJ climax. Alot of different elements and I'm not sure of what I've covered already. Some things that have been covered by other sources here, too.

The Emperor's Throne Room: An enormous circular area a thousand ft or more in diameter. A black floor. In the center is a raised circular platform with the throne at the very center of all. There is a mote shaft surounding the throne platform that goes all the way to the station core. There is a magnetic containment field dome projected over it all. Maybe a black sunshield, like segments of an orange peel that extend up from the perimeter. All this was intended to be as grand and inexpensive as possible.

Originally, Vader was to land in a shuttle (now a TIE shuttle.) The emperor was to land in a special tractor beam lowered and raised armored pod. It was shaped like an egg from 'Alien'. It split open from the top and had enough room for the seated emporer and six of the guards. This was a twisting of 'CEOTTK' and 'ET'. I saw a suggestion here from a while back that said the emp should have a special heavily armored shuttle carrying his throne. The problem with landing directly in the throne room is that the audience might realize there is an immediate means of escape before the climax.;/ Maybe Ani gives Luke the key code for an escape pod just below the throne room? ;/ Deus ex machina but a link to the beginning? ;/

Edit: This escape pod might only have room for one person. Vader activates it for his son.