Murphys Law is the law of the ocean. If a design is directional, there will be a way it will get turned around... in a storm... and people will die or get badly hurt. I've seen currents perpendicular to the wind. We are still talking about 200 miles off-shore right? Don't try to reinvent the wheel when you aren't even using said wheel. Build off the off-shore oil platform...platform. Everything needs to be able to be submerged for minutes at a time. Rogue waves and hurricanes are real. If you don't account for them, you have blood on your hands, maybe not in 5 or even 10 years, but it will happen. The best insurance against them isn't a group of humans ability to react, it's in the structure they inhabit.
For connectivity between units, use a fractal design/layout to promote scaling in both directions. As for the issue in the small direction, the nail that sticks out gets hammered, so have a linking system and a shape that resembles the way barnacles attach to objects, ie to envelope. Then think 3d, smaller individuals latched on/in by the water line to the larger (hex shaped?) unit. These units will need some inherent design to deal with being really submerged. Again, one must design for water flowing everywhere, if you don't, people die. Hence why all seafaring boats are designed like this. Have you talked to any colleges to incentivize design testing in small scale? Having started designing and making things myself in the past 2 years I learned thst thinking to much is a problem; you can think around in circles for years. The only way forward is to try, try, and keep trying.
I wish to get involved, as I see seasteading is at least a potential lifeline to the crumbling societies all around us, if not the best chance at having a governance revolution and therefore real prosperity for the human race.