I think if a barge were the way to go in hurricane territory, the oil industry would have used a barge.
They got the funding to build gold-plated barges, if that was the best way to seastead the way oil rigs do.
And i ain’t talking about just flip ships, even though seems like they could also be used as a forest, and then connected with some kind of pontoon bridges maybe?
That way folks could have their sea property surrounding their flip ship, like they used to having on land.
A 4 spar design oil rigs seems just right, because that’s also a proven design, as are their single spar platforms.
One spar of 4 could have a medical clinic, the other a supermarket, the other 2 dwellings.
Seems like each spar is certainly big enough to have a heck of a big usable space in it above surface, and plenty of storage down below.
To get started, seems like the cheapest way might be to have old oil rig spars refurbished for seasteading, after having all the unnecessary drilling stuff taken off and the top platform repurposed for whatever the seasteaders need.