As promised I took a look at the save now that I have more free time
Its been a while since I've done an observation like this on Civ3 so bear with me as regard to mistakes.
First my obervations as of turn 51 (sorry if it has already been mentioned):
The map is 50 wide and 50 high. Therefore there are 2*(50*50)=5000 tiles.
Our island is 17 wide and 17 high and is a rough diamond. We have about 225 tiles on our island before lakes.
Not including lakes or coast we have ~66 tiles for 3% of the land mass according to F8. Can't remember if the 3% including lakes or coast.
Therefore about 22 tiles is 1%.
Therefore our island is about 10% of the landmass. Granted every estimate we have here increases the error of the 10%, I can see it as much at 15%.
Lets assume that everyone has about the same start.
This means that 50%-75% of the land is the starting islands.
Now we move on to how our islands are arranged. There have been a few theories about this however at this point however there is not enough data yet to figure out how the world is shaped at least one I can't find.
Some have suggested a ring but a ring doesn't have every the same distances away from each other, which might not be necessary true.
I've thought of other configurations where the theory that we are all the same distances apply however as stated before there is not enough information to determine that yet.
As for the Lighthouse I think it will be very important for this game, I also think we are not too late yet because I'm guessing all teams are currently expanding and not thinking about wonders. Furthermore we are most likely ahead in exploration or in the top 2. I think we should start a prebuild soon. It needs to be coastal city which reduces our choices to our curragh city or a newly founded coastal city. I like the second, more specifically the brown dot north of The Admiralty in Paul#42 dot map
15 posts down. Worst comes to worst we are left with pymarids or great library.