Regarding the content, I would suggest leaving Banking for Mansa to research, thus going to 100% culture a few turns sooner.
I couldn't get it in trade. After beelining CoL/Alphabete, I went to trade, but he already had CoL. So there was the first missed opportunity. The second missed opportunity was he surprisingly reasearched Paper right as I was finishing Education. He must have run out of things to research, and now we definately know that Paper is at the rock-bottom of priorities for AI research. I was thinking if I gave him Paper, even with the GS pop on Edu, he would win the Liberalism race; I couldn't allow that seeing in other games how painful it is to get late Nationalism and Hermitage. (As a side note, I think my trade of Natio/Lib netted like 8 techs, cash, and a map... Mansa's a nut

)
I just miss one important highlight: the date you built the NE and the number of artists specialist your GPFarm was able to support.
I'll look up the date when I can see my logs better, but I know it was late. With Banking, I had a solid seven artists. The capital and other legendary produced 2 artists apiece, supporting 5 and 4 artists repectfully after I specialized the miners.
It's interesting that you bring up the point about the NE. My slavery skills could use some work, and I feel, while the GP farm was always running an artist throughout the game, I think I got caught up in optimizing/perfecting that city with some extra builds (lighthouse, harbor, etc) that could have waited or weren't necessary. In other words, that city should have had the NE and 3+ artists much sooner. In fact, now that I think of it, I actually whipped in the NE...

It's probably best not to slave away your specialist population. Normally, the GP farm is the second city that I build, but I had to rush a settler to a very good production/cottage spot before being boxed in; you know how it is on Deity. Finally, Literature came after Liberalism as well... messy game, but it is a win.
My purpose in posting regarding this win was to inspire some more conversation in this excellent thread. I have to look at some others' dates, tech paths, and build orders to improve my own game. I'm glad to see someone feels I've got the idea down, but clearly there's a deficiency somewhere; perhaps others would benefit pinpointing that as we look to always improve our own games.
Finally, it will be interesting to see how this all fits into BtS, and I'm curious as to others are coping with cultural wins on Emperor and up.