Pretty cool, but i dont really see how it is related to seasteading. Am i missing something?

Farming on the seastead would be extremely valuable, if it can be perfected. I found the reference to Salicornia plant to be very exciting. Biofuels could be a major cash crop for a seastead. But where do you get the 'space' on  seastead for growing a crop like this, or even for other food crops?

I don't have the answer to this (yet), but what is clearly needed is a structure that can survive storms, or at least be moved out of the way of storms, that is very low cost and can provide a large amount of surface area for growing of crops. What I'm thinking are large inflatable greenhouses.

Have you seen pictures of the navy's hovercraft? They are very large and can operate on land or sea. They use a very durable thick plastic/composite and inflate it. So, could you make a huge floating structure out of inflated plastics/composites? These platforms could be made very large and should take the elements well. The sides would be very high to protect the contents inside, but the bottom need only be thick enough to provide the necessary floatation. They can be towed to avoid storms. I have no idea if the construction would be cost effective, but it would likely be suitable for the growing plants, as I don't think plants are bothered by wave motion. Pollination issues would still have to be addressed. you might also be able to raise animals inside, such as chickens.

And yes, i am worried about how it would handle rough seas, but I suspect there are ways to keep plants upright and firmly rooted.