Overall Assessment: Your design is creative and well-thought-out for containerized deployment. However, there are several fundamental structural and hydrodynamic issues that would likely prevent reliable operation, especially in anything beyond very calm conditions.
The three buoyant legs are attached at the corners of a 44 ft equilateral triangle. This creates massive lever arms. When the structure moves or encounters waves, the legs will generate very large bending moments and torsional forces at the three corner connections. A 7 ft high wall section (even if reinforced) has very little depth to resist these forces. The structure will likely flex or crack at the leg attachment points.
With only the lower half of three relatively narrow foils providing buoyancy, the metacentric height will be low. The large above-water triangle creates significant windage. A 1 ft change in draft = ~1/7 of total buoyancy means the platform will have a very "soft" response and will roll and pitch significantly in even moderate swells.
The 3 ft walkway is only 1 ft above the bottom of the wall. Any wave higher than ~2–3 ft will slam into the underside of the walkway and the lower edge of the living area walls. The aluminum grating will not meaningfully reduce slamming loads. This is a major fatigue and safety issue.
Six fixed 1.5 ft RIM drives (even with differential thrust) will struggle to maneuver or maintain heading on a 44 ft wide structure with high windage. The lack of any steerable thrust or rudders makes station-keeping and docking very difficult. The coordination required to safely connect two moving seasteads via a walkway is extremely challenging in real sea conditions.
The current configuration tries to combine a large living platform with a minimal-waterplane SWATH-style concept, but the structural load paths and wave interaction make it fundamentally problematic. Consider either: