One more issue for ESB - fans which i like to mention was cosed by this "wrong floor" problem of accessing the Vent pod. Step by step please now, very dangerous issue. It's called "intercutting".
@Imperial fighter: I tried to find any reason for flipping any image in a Vent pod till Platform duel-part. The only one I saw was the completely wrong tunnel-direction Luke is stepping out from. I couldn't find ANY other reason to flip anything else really, because everything else looks exactly where it should be.
As I said before, there may theoretically be more tunnels Luke goes trough to come to the round window chamber and not only that long one in extended access arm, tunnels and elevators which bring Luke not only to higher floor but also to exit the tunnel from almost opposite direction to the extended access arm, because someone designed the room that way (no foult on anybody).
What brings me to another issue. I have a very good reason to suspect that it wasn't planned to look "wrong" way on the end, and it just came to my mind WHY because it was an issue on my my own recut of ...The Phantom Menace.
In one of Star Wars Documentaries about making ESB Kershner talks about how the first version of a movie was much more intercutted between different action places and "it just didnt work" so they had to recut it again in a completely different, much slower manor (that means remaining on the same place of action for longer time so people watching could have more time to feel and identify with characters wich keeps the tension high rather then jumping all the time from place to place and all you can see in a short cut is a group of people running trough a corridor like later in Ph. Menace).
The new result was much better for everybody then, and they left it this way, connected it trough sounds and music and we all loved it exactly this way because it was like magic. Of course I would like it to stay that way.
Now... back to our tunnel - floor problem. I suppose that the Duel sequence "Carbon chamber - Tunnel - Round Window Chamber" , in final film presented as ONE was in the first edit intercutted in TWO and it looked like this: "Carbon Chamber - Entering tunnel (maybe even some walk trough it so we see how long it is) - INTERCUT Leia and Chewie running around to save Han - Luke exiting another tunnel after elevator or something - Round Window chamber duel". In that version there were no soundeffects suggesting that the tunnel is ca 20 m long and is in the same room/place/hall as round window chamber etc. (if there were any at all at that stage).
In second and final, slower intercutted ESB edit two different duel places are in one scene and Luke's approch between them looks wrong despite they tried to cover it by showing the Vent pod from outside (suggesting direction of a long(!) tunnel) much later after Luke falls out a window plus long intercut with Leia & co.! And, admit it, folks, as you first time saw this movie, you didn't think go like "oh that's how Vent pod looks like from outside, so the tunnel Luke exited 2 scenes before was made in wrong direction!! Bingo!!".
That first more intercuted edit of ESB may be the answer for all geografical problems with that scene, but it would be interesting to ask Lucas or Kerschner... if they remember .... :-)... to find out definitely, among some other things too.
Personally , I wouldn't like any intercutting tempochanging changes in Adywan's version, except it works absolutly great, which he can judge really well, so I trust he will do a good job with this, regardless which way he decides to go with it.