The only new structure is a camp which is a stonesthrow away from Dragonclaw Rock. It's due north west of it. The only large mod I found in that area was UL Snowdale, and the mods now been made to be compatible with that. There were just a few issues with newly added trees and rock blocking waypoints
I can't imagine there would be any compatibility issues with FCOM
FYI: OOO adds Skyrim Bandit Clans, that have strong essential NPCs patroling that area near DragonClaw rock (Vyka Hurslt), Also, their base camp is north from Dragonclaw rock with about 3-4 bandits at any given time present. That could create some unwanted NPC kills from your mod.
Also, Addonay's classical weaponry adds the really strong Addonay's Shade Wraith at the DragonClaw rock, and that again could single-handedly kill a legion of NPCs. Hope you don't have any NPCs hanging out in that area...