Why not simple, stable platforms that look like semi-submersible drilling rigs? A single platform can be made to be high enough to ride over all waves. The cylindrical buoyancy system can use pumps and valves for automatic buoyancy control.
Then you put anything you want on the platforms, and add to and connect them as you see fit to expand.
With most of the displacement below the wave range, a single platform is already extremely stable, and more so when interlocked in a matrix.
I like Kim’s ideas of station control which could be adapted to this concept.
I drew this out to have 30m platform squares, and 100m buoyancy cylinders. That’s just TLAR (That Looks About Right) engineering, so the scale may have to increase to ride above the 99 percentile rogue wave.