Could there be a more creative way to make the Culture victory more challenging and interesting? For example instead of one Utopia project have three or so to be built? But that would be tedious? What about filling each tree unlocks one project which needs to be built separately and they've have different conditions as well (Tradition needs a capital of size X, Piety needs x temples, Patrionalism needs 4 CS allies, Commerce needs x luxuries)? Would that be possible and feasible? Or too far from the scope of VEM? Together with that you could drop it back to 5 and thus allow some more flexibility.
i definitely agree that this would be a more flavorful and exciting way to pursue a cultural victory (which at a certain point always seems to become a game of just waiting out turns, so long as you're not desperately defending yourself---which at least in my experience never happens because the AI doesn't react to VC like a human would, but that's another issue...).
There is already existing game mechanic along these lines which might be a useful model/tool: spaceship construction for the science victory. in this case, the cultural "spaceship units" would be special buildings unlocked via particular trees and built in one or several different cities:
TRADITION finisher allows construction of a special enhancement to or improved capital building;
LIBERTY finisher allows construction of a happiness/entertainment type memorial (or see freedom below);
HONOR finisher allows construction of a special war memorial;
PIETY finisher allows construction of a special religious site/memorial;
COMMERCE finisher allows construction of a central bank or some sort of industrialist legacy building (trade center?);
PATRONAGE finisher allows construction of a special foreign office/diplomatic type building;
RATIONALISM finisher allows construction of a specialized national research facility;
FREEDOM finisher allows construction of a bill of rights (or something similar) memorial/declaration;
AUTOCRACY finisher allows construction of a special memorial dedicated to the leader;
ORDER finisher allows construction of a special memorial dedicated to the people, like a "Labor Day"/"May Day" memorial.
This is just what first comes to mind, so we can definitely be more creative/historic with the selections for these building types (and if they have any buffs...). I think the fun part is the additional flavor of each building unlocked per tree. They don't necessarily have to be as expensive as spaceship parts, but I think add more complexity/strategy to the game, which is always a good thing, right?
great idea mitsho!