Based on your description of a 40 ft by 16 ft living area for the seastead, with modular construction in mind, the key is to break down the body into smaller, shippable components that can fit into standard shipping containers (e.g., 20 ft or 40 ft ISO containers). Internal dimensions of a standard 40 ft container are approximately 39' 5" long, 7' 8" wide, and 7' 10" high. You'll want to design panels, frames, and beams to stay within these limits, ideally under 4 ft in width/height for easy packing of multiple units.
Since you're planning to manufacture in China and ship globally, focus on modular, bolt-together designs using materials like marine-grade aluminum (e.g., 5083 or 6061 alloys) or duplex stainless steel (e.g., 2205 grade). This allows for assembly on-site with minimal welding. A corrugated plate structure, as you mentioned, is a great fit for strength, lightness, and ease of shipping.
The tensegrity design with rubber isolation between legs/floats and the body is noted—this can help with electrical isolation to prevent galvanic corrosion if mixing materials.
To make the 40x16 ft living area shippable, divide it into modular sections. Aim for pieces that are flat-packable, with dimensions under 4 ft in one axis to allow stacking 4+ per container (as per your float constraints). Use bolted connections for assembly—avoid designs requiring on-site welding to simplify setup.
Total: The entire body could fit into 2-3 standard 40 ft containers, depending on packing efficiency. Use CAD software like SolidWorks or AutoCAD to model and verify fits.
For detailed blueprints, I recommend consulting a naval architect or using simulation tools to refine this.