Wow - I hope you'll write that up in more detail. The save seems to include a number of interesting ideas.
Quick post in this thread just to say that I was lurking in here yesterday, and wondering myself about the way to manage the

issues in this kind of expansions.
Awesome Idea!

Sincerely impressive. I would never think about it (and neither have the skills to, of course). Excellent example, I downloaded the save.
yatta.
Btw, also UncleJJ game
posted above was (different but) well played and interesting IMO, I downloaded that file too.
Thanks for praise, but this really isn't save game you should take example of, apart from initial idea.
I can give a quick summary if you like.
I opened with workboat followed by worker, noticed that I was working grassland forest when workboat was half finished and as the result finished it at pop 3

Tech path was AH-wheel-pottery-mining (mined all hills and started settler)-BW-masonry-fishing(those two should have been switched, but I was still building settler so it was only half as bad)
warrior was running around coastline to open up trade routes
Then I chopped lighthouse and TGL and spammed some cities. Teched writing-Alphabet, but started to trade only ~10 turns later
made some trades with AI and spammed some more cities.
Got Currency and CoL. CoL turned out to be worthless though I got religion and would have had bunch of courthouses in next 50 turns.
Gifted AI currency to get more trade routes and traded for gpt (they didn't have much)
Made 900g worth trade mission and spammed some more cities.
Settled inland cities last, few food resources there.
As I mentioned lot of micro mistakes (f.e. traded one of my 3 iron for Ivory only in last few turns, despite the fact my capital was unhappy for long time, DIDN'T REVOLT INTO SLAVERY, forgot about it and regretted it afterwards.
THE END