My commentary so far:
1) Plus yields on luxuries need to be distributed evenly, but every ressource should just get one (except the +1 faith ones, those could get a second one). These can be moved around later on to balance between 'geography' and 'technology'. That said, do the modern strategic ressources really "feel right" on the forge?
But, that makes the mod not compatible with more luxuries. I don't use that one, so I don't care. Are there people that do? (to the silent majority reading

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2) Observatory requiring a mountain within 2 tiles, 2 science and +10 (15?)% science is fine, flavourful and good

However, yield inflation may be a problem very generally. It doesn't strike me as particularly big of a problem right now.
3) I'd like for the barrack line to be viable in other cities as well. It's kinda sad that you only ever build one per game. Barracks are ubiquitious in real-world cities after all.. However, yield inflation. Thus I'd propose:
Barracks: Garrisoned units cost no upkeep (or 1 free unit per barrack?)
Armory: Culture if a unit is garrisoned in the city
Military Academy: Science if a unit is garrisoned in the city
I know the experience boost is already strong enough and this could make them overpowered. I just wanted to bring the proposal forward
