Very good! I've seen charts like these before but they displayed the tech tree in use in a mod (with heavily modified tech tree), so they were worthless for playing the base game.

One thing is missing though. Some of these techs give you abilities or units or cities without them showing up as a tech tree entry with their own name on it. For instance: say you want to be able to build arboria (or whatever the plural should be). There's no method using either the game or your chart to tell what research chain to follow to enable them.

This is true. But still these are really helpful and appreciated !

Perhaps a future version could have small annotation numbers in the bubbles and a corresponding side bar list that would tell what building they make available?