Seastead Design Review & Optional Extras

Your MVP design is impressive: a container-packable, solar-powered, foil-legged trimaran-style seastead with redundant power, redundant propulsion, and a soft ride from small-waterline-area legs. Starting with a fixed heave plate (instead of active airplane-stabilizers), no tension legs, no kite, and no inter-ship features is a smart phased approach — it gets you to sea trials with the minimum complexity, and every "optional" you've linked is a genuinely compelling upgrade path that adds value without redesigning the hull.

The five upgrades you listed (active stabilizer trimaran, tension legs, kite robot, ship-to-ship transfer, convoy mode) cover the four big "wants" of any liveaboard platform: stability underway, stability at anchor, backup/auxiliary propulsion, and community. That's a very complete roadmap.

Thoughts on Your Core Design

Packing geometry checks out. Three 14.5 ft legs end-to-end = 43.5 ft, fitting the 44.6 ft container length. Three 44 ft wall panels would need to be in segments (since the container is only 44.6 ft long) — you'll likely want each triangle side as 2× 22 ft panels with a bolted splice, which also helps with handling weight.
NACA 0030 with truncated trailing edge is a good compromise. Max thickness of a 0030 at 8.5 ft chord = 2.55 ft, well within the 7.7 ft container width even laid sideways. Truncating the last 6 inches gets you under the 8.9 ft height — good call.
Conduit on the trailing edge avoiding through-hulls is excellent for safety and longevity. Consider making it a removable/inspectable channel so wiring can be serviced without dry-docking.
Triple-redundant power per leg is one of the strongest features. Pair each leg's inverter with its own MPPT solar string (roof divided into 3 zones) so even solar harvest is redundant.
The "servo tab" elevator on the stabilizer airplanes is elegant — tiny actuator, huge mechanical advantage. Just make sure the pivot has a small amount of positive static stability (slight nose-down trim) so a power failure causes the wing to go to neutral, not to dive or stall.

Additional Optional Extras Customers Might Want

Comfort & Liveability
Watermaker module: A small reverse-osmosis desalinator (e.g. 30–60 gal/day) packaged as a drop-in cabinet. Solar-powered and essential for long stays away from shore.
Composting or incinerating toilet package: Avoids black-water tanks and overboard discharge regulations entirely. Very popular with off-grid liveaboards.
Climate package: Mini-split heat pump (heating + cooling + dehumidification) sized for the ~840 sq ft interior. Critical for tropical and high-latitude buyers alike.
Interior fit-out levels: Offer "shell," "comfort," and "luxury" interior packages — bunks vs. staterooms, galley grade, etc. Lets you hit multiple price points with one hull.
Skylights / cupola: One or more transparent roof panels (between solar arrays) for natural light and stargazing. Big quality-of-life win.
Safety & Reliability
Emergency sail kit: A simple junk-rig or wingsail that mounts to the kite track, for use if the kite robot fails or for silent cruising. Truly redundant propulsion (solar + thrusters + kite + sail).
Life raft + EPIRB + AIS package: Standard offshore safety kit, pre-mounted in a known location.
Lightning protection / Faraday cage upgrade: A bonded ground path from the roof through one of the legs into seawater. Important since the structure is largely composite/aluminum and electronics-heavy.
Bilge / flood sensors per compartment: Each airtight leg compartment gets a water sensor reporting to the main computer — early warning of any breach.
Anti-fouling package: Either copper-infused coating or a low-power ultrasonic anti-fouling system on each leg. Saves enormous maintenance time.
Connectivity & Autonomy
Starlink + cellular + HF radio combo: Pre-installed with automatic failover. Internet anywhere is now table stakes for liveaboards.
Autopilot + station-keeping mode: Using the 6 thrusters + GPS for dynamic positioning when not on tension legs. Useful for fishing spots, dive sites, or just holding position in a calm.
Remote monitoring & "away mode": Owner can check battery, position, bilge, cameras from anywhere. Big peace-of-mind seller.
Collision avoidance radar + camera AI: Especially important for slow-moving solar craft in shipping lanes.
Recreation & Lifestyle
Underwater viewing port / camera: A window in one leg, below the waterline, or just an always-on underwater camera streaming to interior screens. Magical feature.
Swim platform / fold-down ladder between legs: A retractable mesh platform stretched between two legs makes a giant protected swimming pool.
Fishing package: Rod holders on the deck rails, a livewell, and a fish-cleaning station on the rear deck.
Dive compressor + tank rack: For scuba enthusiasts. Electric compressor runs off house battery.
Kayak / paddleboard storage: Davits or roof racks (compatible with the solar layout) for small craft beyond the dinghy.
Hot tub / cold plunge: A small insulated tub on one of the corner decks, fed by the watermaker and heated by excess solar. Surprisingly popular on yachts.
Telescope mount: A vibration-isolated pier on the roof for astronomy — seasteads far from light pollution are amazing dark-sky sites.
Productivity & Income
Office/studio package: Soundproofed corner, good lighting, professional video background — for remote workers and content creators (a huge customer segment).
Aquaculture rig: Hang lines for oysters, mussels, or seaweed from the underside of the triangle between the legs. Could be food or income.
Science package: CTD sensor (conductivity, temperature, depth), weather station, hydrophone — for researchers, citizen scientists, or just curiosity. Data could even be sold.
Mobility & Range
Range-extender generator: A small propane or diesel genset as a "get home" backup when solar is insufficient for weeks (e.g. high-latitude winter). Many buyers will want this for insurance.
Towable fuel/water bladders: For long passages, soft bladders that trail behind on tethers, adding capacity without permanent tankage.
Higher-thrust upgrade package: Larger rim drives or an additional pair for owners who want faster transits.
Modularity & Expansion
Second-floor module: A smaller triangular upper deck / observation lounge that ships in a second container. Massive upsell for the same hull.
Greenhouse module: One corner deck enclosed as a hydroponic greenhouse — fresh greens at sea.
Workshop / maker corner: 3D printer, small CNC, tool wall — for the self-sufficient owner.
Pet package: Astroturf relief area, pet door, secure railing mesh. Don't underestimate this — it sells boats.

Summary

Your MVP plan is sound and your five-feature roadmap is genuinely differentiated. The features I'd most strongly encourage as near-MVP options (because they're cheap, light, and high-value) are:

The active stabilizer airplanes and tension legs are your big technical differentiators — those should be the headline upgrades. The kite robot and convoy mode are the visionary features that will get press attention and attract the early-adopter community you need.

This is a genuinely exciting design. Good luck with the build — I'd love to see it in the water.