Just submitted a T199 Deity Babylon SV that was quite interesting, as you can probably guess by the end game screenshot.
The game plan - building on some previous partial games, also on GP - was a 4-city NC, with each of those cities aiming to pop 2x GS. I intended for 'light war' for much of the game, looking to produce 2 GG (grab additional resources for the gold), possibly capture/sell a few cities, and capture/keep 1-2 cities (looking for neighbours to build wonders like ToA). Self founding a 5th was always an option. On this map, I had room to self-found 6 cities (2 after NC). I stayed at war with Venice to pick off trade routes and eventually accept their 2nd city (Belgrade) in a peace deal, which I sold (only got ~1,000 gold, ~T165, which was disappointing).
There were only 2 Cultural CS on the map and 1 was conquered early; however, I was able to get 19 policies (Tradition, Rationalism, Freedom, and Commerce opener) with several turns to spare.
I completed the last tech on T196, which would have lined up for a T197 finish, but I really messed up on gold - didn't start trading gpt or switching trade routes early enough - given that I knew I couldn't possibly reach Merc (25% off). I needed 2 additional turns to gather enough gold, and probably sold close to 30 buildings.
Happiness was a constraint for much of the game. The map had only 2 Mercantile CS, both with Jewelry (no Porcelain), so a total of only 10 unique happiness from CS. For comparison, maps with 3-4 Merc CS and both Jewelry/Porcelain would have 17-20 unique happiness from CS. I had access to every luxury on the map perhaps the earliest I've ever experienced, meaning permanent WLTKD, but little room for growth. All 6 cities were beside mountains. The 2 post-NC cities had a lot of building to do and no time for Colosseum. Late game I was hit with 11 unhappiness from ideology; this was after winning WF and using 3 GW (timed with WF win golden age), which brought me to -1, so I had to buy a building just to bring that up to 0! The last few turns were chaos, with rebels appearing T198 and apparently a city will revolt and flip coming in the next couple turns.
While I was unable to found a religion, I got good value from DF pantheon and was able to buy 4 Pagodas and a Monastery. Accumulating >3,500 faith, I bought 2 GS and 1 GE (SoL).
CS count was
5 Maritime, 3 Militaristic (Venice nabbed 1), 4 Religious, 2 Cultural (1 conquered), and 2 Merc.
With happiness issues, a Maritime CS that doesn't offer a unique luxury is nearly useless; the capital benefited from some Maritime Friendship. Resolving quests for the Militaristic CS helped with my early army, saving me hammers/gold and allowing me to focus on other things.
17 GS
1 from Writing
10 produced by cities
4 from wonders
2 from faith
10th city-produced GS was T194, from one of the 2 post-NC expos, both of which could have built a garden but did not need to.
Looks like it would be possible to get an 11th city-produced GS by ~T194, but would most likely require a 7th city and gardens in all. 3 from Faith is of course also possible, although in this specific game I needed a GE for the SoL free policy to open Commerce and allow me to build Big Ben, so even if I had reached 5,000 faith, I would have chosen 2x GE.
My spies stole Banking, Gunpowder, Navigation, and Archaeology which is awesome! Banking definitely helped on the way to Scientific Theory. The last 2 steals were wasted by me messing up on gold and taking 2 extra turns at the end anyway.
Key timings
~T82 4-city NC, next 2 cities founded over next 5-10 turns
T92 Education
T141 Sci Theory (no bulbs)
~T150 Freedom
*used Oxford on Radio, 5th and 6th cities were both able to build granary, watermill, library, and university in time
T167 Plastics (2x GS)
T196 completed final tech
T199 SV
