Odd things in the Roman Building Tree

[Piddyx]

Well, I just finished a chart of all the Roman Buildings. I've noticed a few weird things that may be mistakes.

Concerning Ports:

A Shipwright (4 fleets) requires a Gov3. A Portup (4 fleets) has no government requirement.

A Dockyard (6 fleets) requires a city. A Shipwrightup (6 fleets) requires only a large town.

Concerting Forums:

There is no stat difference between a Forum and a Great Forum.

Concerning Grain Silos:

There is a -1 trade for a Garin Silo. Maybe this was intentional, but it seemed odd to me.

Irrigation gives both a Farming bonus and a Growth Bonus. I think this might mean it gives a +30% bonus, not +15% as might as have been intended.

I will post my chart one I figure out how to add an attachment or host a file.

http://www.axifile.com/?4052871