Something I noticed, in this script, and obviously scripts prior to it, the Engineer's city was, just that, a city. With buildings. There's no great big hole in the middle.
However in the last act of this script, they're in a part of a city that's a sporting arena. And almost all of the Engineers are located at this area when the bomb is dropped. So while waiting for Tennesse, you get a good glimpse at all the petrified Engineers, in the Colosseum trying to run, in and outside of it. In the center of the arena are Giger-esque objects of unknown purpose. The script takes a pause to consider, what they were doing here. The script basically asks whoever was reading it, to try and figure out for themselves why they're all in an arena when they died. It's just a set piece, the Engineers were playing some weird Roman or Meso-American sport. The rest was organized like a city, basically.
Subsequently when the script changed, and so did the overall plan and design for the city it seems.
see here
Buildings are built around a giant open space. As if, it was an arena.
I'm just shooting the shit at this point, but the details match so much that Ridley may have just decided "let's make the whole city sort of designed like a Colosseum. This script mentions "bizarre Giger like objects" near the center. Gus's what's in the center in the movie, the few Juggernauts in the in the middle, underneath an opening, and the mother juggernaut floating. The script changes the Mother Jugggernaut's location from the atmosphere in this script and in concept art
see here:
to here:
The middle. Exactly where the script says the "giger like objects" in the Colosseum they ran into in the finale were.
That's really odd, and the similarities are undeniable. You go from what a city looks like, to the plans of the set described in a scene in the finale in a gladiatorial-esque Colosseum. That might imply a lot. It might not, but I have a feeling there was a reason the layout of the city quickly changed between August (the month of this draft) and November ( the month of the last draft we have). It feels like a Ridley made decision, one can only speculate as to why that may be. The Engineers weren't congregating to meet David in this draft either, they were minding their own business, which was mostly to watch some sort of game the majority got petrified in.
So, in conclusion via design of the city and the design of this script's finale
You chance the design of the city into one with a vast open space surrounded by, rows if you will., that's check You have specific placement of Giger objects, check. An audience congregating to said arena waving and having a good time when they get bombed, check. The finale taking place in an open public space...check.
When David arrives, they really do act like its a sporting event of unknown play or purpose. They changed the structure of the city to look like the Colosseum
I think people can fill in the dots from here.