Interesting that they chose an 8 meter diameter, probably assuming a launch on the 9-meter Starship as Blue Origin's New Glenn is only 7m diameter. It would be interesting to see a weight projection for a completed module to see how well it fits within Starship's planned capacity of between 100 to 200 tons to orbit.

A 50cm (max) gap between the module's outer edge and Starship's inner edge does not seem like much room for support or deployment infrastructure in the launch vehicle, and would also require bay doors that fully open - and maybe a robot arm to safely deploy.

I haven't seen any reference to explicit collaboration between Gravitics and SpaceX. Maybe it's still too early, but I would hope the two have open lines of communication to avoid expensive redesigns later on.