Originally posted by Morlac
Short answer:
You're not overdoing it if you are having fun writing it.
Long answer:
Depends on how ambitious you are and how you want to shape the storyline. So far, you seem to have moved well beyond the very straightforward "event log" style of AAR, towards something which I think of as the "hybrid" AAR. It's still clearly recognizable as a description of the events of a game, but those things begin to be subordinated to some kind of overall storyline. The AAR mentioned by J. Passeportout is yet another type, the totally narrative AAR. It focuses almost exclusively on character and story development. The underlying game play is deeply buried, and a casual reader might not be able to even determine that it's tied to a game.
(The hybrid, by the way, is the most common form of AAR in my opinion...)
If you are striving to write a hybrid, then you need to consider what your story development goals will be. Perhaps you will only go into this much detail at the beginning, and then become much more terse as time goes on and the author has established patterns for the reader (e.g. this is how I handle rebellions, it then happens periodically for the next thirty years...) This is very common for authors in this situation who decide they don't want to devote that kind of time to writing, but it is also a common device for authors who have a more limited story in mind, and don't want to push it further.
Or perhaps you will pick certain "pivotal events" or improtant historical figures to write about at this level of detail, and go with a more abbreviated style for long periods in between (that's what I've been doing in my AAR).
Or, and this is the least common, perhaps you have plenty of time and will write at this level of detail for the entire 300 years...
Wheee, that raised a lot of questions in me.
Under what category falls "an alternative history of Brandenburg from the rulers point of view"?