Has anyone made a more detailed map of the immediate area around Fort Rannick? Of course I am familiar with the map showing the area from Claybottom lake up to the Storval Deep, but I'm a fan of wilderness exploration and it could be interesting to have more details for PCs scouting around prior to the attack on the fort itself.
It appears as if the stream that serves as a moat for the fort must flow down into Skull river, where there is a crossroads with the road that continues up to the dam at Skull's Crossing. It also appears that there must be a fairly wide, wooded valley floor south and west of the fort itself.
I don't think it is at the scale you're seeking, but Wayfinder #7, the free fanzine, has the Hook Mountain area done up for the Kingdom Rules (as they were in the Kingmaker AP, readily usable with the Ultimate Campaign version).
Hey! Yeah I actually stumbled upon that right after I posted. It's kind of like what I was looking for.
In another thread, I read Nicolas Logue, the author of this episode, speaking about back trails and whatnot. I'm thinking about slapping together a map even a bit more detailed than the one in Wayfinder #7, as well as the different valleys, ridges and other terrain features right around the fort. Could be fun for clever players to work out the back ways around the area in order to use them.
Presumably, there would also be other Kreeg ogres or ogrekin in the area, in addition to Mammy Graul's brood. But Wayfinder #7 does place a number of additional hazards.