Each fort uses Imperial Fort pieces, and has a barracks / jail / player home tower and a garrison of about 20 (all on AI schedules).
There is an .esp that adds drinking fountains (from MannyGT's superb Drinking Fountains of Skyrim mod), for you RP fans (DFOS plays well with RNAD).
At start, the garrisons are:
Elenhir Pass, Pale Pass: Imperial garrison
Rift Pass, Dunmeth Pass: Stormcloak
Jehanna Pass:
I am starting this topic as a clearing house for questions I have and interacting with users separate from DovKroniid Redoubt, since this is essentially taking the mod in a different direction and is in essence, a separate offering (at some point I may actually pull it out with TES5Edit, or another tool).
STATUS:
Elenhir Pass - DONE opposed by Hammerfell Alik'r garrison. Also includes Khajiiti caravan border crossers and connection to Caravan Depot at Falkreath.
Pale Pass - DONE
Rift Pass - DONE opposed by Redoran Guard garrison
Dunmeth Pass - DONE opposed by Redoran Guard garrison
Jehanna Pass - DONE
Adding bBorderRegionsEnabled=0 to the [General] section of your Skyrim.ini file will be recommended if you wish to fully interact with most of the features.
May also release the tower / home/ barracks/ jail interior as a fully navmeshed modder's resource.