I managed to basically build all of Italy as well as add Londinium among others. Got the Celtic starting city done and the Roman starting city done, so my next priority is completing Europe and the Iberian Peninsula and then a bit of Africa to get Carthage's cities, the rest of the Celt cities, France, Spain, and Portugal.
I do need to add non-road improvements (irrigations and mines), and maybe adjust some of the terrains (not to mention, remove nation prefixes from cities that aren't actually duplicated), but the basic map is coming together I think. (I can't do resources or barbarians or goody huts until after the map is complete tho.)
So I've got a long ways to go, but progress is progress!