Honestly, I'd prefer one Stronghold type building where it can be expanded and upgraded, ideally with each recruited companion (Origin and Non Origin) as well as Camp Follower (Like Volo and Scratch) having their own room or section that has been customized for them and their interests, it'd make it feel like a home base in the city of BG, with the camp itself only coming to play when you are not at/near the city. Alternatively our Stronghold doesn't necessarily have to be in the city of BG and it could be some fitting structure we find, perhaps the home of whoever is putting these waypoint sigils down...