Good research. I would also add that nomad ships have "bones" as well, they're barely seen in game due to transparency effect but you can clearly see them in model viewer. Those bones are keeping mass intact, I suppose those "bones" are very very strong to sustain strong gravitation fields and going through jumpholes. But because of fluid organic nature of the ships those bones never collide with each other allowing the ship to possibly sustain extreme environments.
As for their method of communication I'd say it's telepathy. Character Blix in original Freelancer SP was able to read Trent's mind (rheinland bar cutscene), possibly the very same thing governor Tekagi was about to do in Tekagi's arc cutscene. Being advanced civilization the Nomads are I think they are certainly using it, at least I do play my characters as they do.
The ships are grown, like an organism. It suggests that ship might go through certain forms and transformations, in other words morphing into something different. Considering the importance the Dyson Sphere held in their civilization I say they are grown like plants with the shielded sun providing energy to grow quick and in large amounts.
So, technically, Nomads could be very well a collection of Nomads themselves and derivate species dedicated for specific tasks in their large society.
