The Arcology Project decision now starts a situation for the planet to transform the planet into an Ecumenopolis, so you can continue creating buildings on your planet while it transforms just like Machine or Hive Worlds.

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The cost for enacting the project is reduced from 20k Minerals and 200 Influence to 8k Minerals and 200 Influence. The cost difference is made up with a situation upkeep costs.

• Standard Deadlines: Finishes in 10 years if used the whole time
  
• Accelerated Deadlines: Finishes in 7 years if used the whole time
  
• Extreme Deadlines: Finishes in 5 years if used the whole time
  

*See images for upkeep costs



Most of the situation choices are tied to your Ethic, Civics, and Origins selections!

Note: Empire Wide bonuses are only applied once

The Research / Education options for Technology Institutes, Military Academies, and Economic Universities (see image 14) are limited based on the Leaders on your council instead of Ethic, Civics, and Origins. You need 2+ associated leaders on your council to prompt the option (Ruler does not count).

Ascension Cities are not shown in the images above as there is too much variation. They essentially give you an extra ascension building, including all its bonuses, as a Planetary Deposit.

• Cybernetic gets an additional Augmentation Center.
  
• Psionic gets an additional Covenant Building.
  
• Biomorphosis gets an additional Genomic Research Lab.
  
• Synthetic gets an Identity Complex.
  
• Nanite Machines get +3 nanites, miner, farmer jobs, +0.5 nanites per 100 miners, and +0.5 nanites per 100 miners
  
• Modular Machines get roboticist / replicator jobs and increased automodding
  
• Virtual Machines get -30% pop amenities usage, and +10,000 amenities
  

Not compatible with other mods that change the Arcology Project decision

ECS is fully compatible with the mods listed below; load ECS below the mods listed here:
Real Space - New Arcologies
Planetary Diversity - More Arcologies
Relic World Flavour
Note: if you add either of the above mods after generating the galaxy, please use the Mod Compat Refresh decision to ensure the security and the continuing stability of your modded galaxy

ECS is likely compatible with the mods listed below:
City World Flavour: Not fully tested, but I haven't seen any issues so far




Arcology Project Decision - changes effect to trigger the situation
Restore Ecumenopolis Decision - changes effect to trigger the situation
Orbital Ring Modules - added effects from the final decision in the situation to the modules.



Hive and Machine worlds to situations is in progress TM and will be released soon TM, trust me TM