Imperialus
Explorer
Sounds like a really cool campaign. I'm assuming you plan on having it develop along more political/role playing lines than a more traditional combat heavy campaign. If so I should probably warn you that the workload for keeping a political campaign interesting is much heavier than one based on a simpler premise such as dungeon hacking or even war. I wouldn't recommend making such an attempt unless you have already gamed with the group for a while and are able to anticipate how the various players will react to the intrigues surrounding them.
Of course with this being a boarder fort it's possible that if you get stuck when it comes to politiking you could have a huge army of (insert favorite badguys here) come rampaging across the boarder and the player suddenly find themselves on the front lines of a war which can be much more straightforward to DM.
Of course with this being a boarder fort it's possible that if you get stuck when it comes to politiking you could have a huge army of (insert favorite badguys here) come rampaging across the boarder and the player suddenly find themselves on the front lines of a war which can be much more straightforward to DM.