That forum has mostly announcements and no tech-talk, so I don't think you will find much info about the forts there.
They talk a bit about the permanent forts in this preview:
http://www.totalwar-zone.de/forum/ap...f143/?7c92f0e8
They don't think they can go over the province limit, they just added 2-3 forts per province, but don't really explain how they did it. They say they learned how to name the forts from an italian mod named Machiavelli 5.0, which seems to be rather unknown in english-speaking fora, and then developed a method that was easier for coding / implementing the forts.
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