We are working on a seastead design. The goal is to design our seastead such that all the parts can pack into a single a High Cube 45 foot container which has: width 7.7 ft height 8.9 ft length 44.6 ft max weight: 62,000 lbs (rated bouyancy at desired waterline is 27,500 lbs and we hope structure is enough under this that humans and their stuff can fit) Above the water there will be a big equilateral triangle frame, 44.0 feet on a side. The triangle frame is also the wall of the living area and will be 7 feet high (floor to ceiling). It will be enclosed and the whole inside the living area. Around the whole outside of the wall, except where the dinghy is in the back, will be a 3 foot wide walkway and railing that is bolted on and has some diagonal supports from below bracing to the wall (so walkway is 1 food higher than bottom of the wall). The walkway will have an aluminum grating that would let a wave pass through but you can walk on. Also two doors on the back side, one two feet in from left and one two feet in from the right side. There are 3 legs/floats/foils/wings/keels that provide the buoyancy, so it is a bit like a trimaran but with a very soft ride. Each leg/wing will 14.5 feet long and have a NACA 0040 foil shape with 8.5 foot chord except that the last 0.5 feet of the thinnest part will be cut short, so with foil does not come to a point at the trailing edge and fits within 8.9 feet hight of container. But the buoyancy is very close to that of an 8.5 foot chord foil. Each of the 3 legs will be attached to the underside of the big triangle near one of the 3 points. The center of the thickest part and going 1.5 feet in all directions from there will be within the area of the triangle, but within that constraint, each leg will be as close to the point of the triangle as possible. The legs will go down so that the lower half is in the water. This makes for a bit of "small waterline area" similar like a small oil platform but one that can move through the water easier because of the foil shape. It is not an extreme SWATH design as a 1 foot change in water level is about 1/7th of the total buoyancy, so still significant change. The 3 legs will all be parallel with the blunt or "leading edge of the wing" side facing forward so it is lower drag when moving forward than a typical cylinder on a semi-submersible platform. Each leg will be 50% under the water (so 0.5 * 14.5 feet) and the top 50% out of the water. On the top half of the front of each leg, so the top half that is out of the water, will be a built in ladder. The reason for these sizes for the triangle and legs is so they can pack into a container nicely and shipped to a shipyard anywhere for assembly. Imagine the 3 legs end-to-end with thin/trailing-edge of foil up and leading edge down on the right side of the container. So the right 3.4 feet of the container (width of legs) is used by the 3 legs. Then the 3 frame/wall sections will be upright (so 7 feet high) next to each other along the left side of the container. I am not sure the width of the walls but if they were 10 inches wide then 3 widths is 30 inches and some extra is 3 feet on the left side. There should still be lots of room in the center of the container for all the other parts. Connecting the mid points of the walls both at floor and ceiling level will be structural beams that make another triangle 22 feet on a side. Then all the remaining spans will be less than 22 feet. The rest of the floor and ceiling will be small pieces that are bolted in. On top of the roof there will be solar all over. With batteries and electric thrusters as the main propulsion system. There will be 6 RIM drive thrusters of 1.5 foot diameter, one on each side of the 3 legs/wings about 2 feet up from the bottom. These RIM drives will be all be fixed orientation to provide forward thrust. It will use differential thrust to turn. For slow movements in tight areas like harbors it can reverse thrust on one side and forward on the other to turn in place. There will be a conduit/pipe welded to the back of the trailing edge to take electrical wires down to the thrusters. There will not be any "through hulls" in the legs. The legs will also have multiple airtight compartments each for safety. Behind the back near the center will be two supports going out and 2 ropes going down to a dinghy. The dinghy is a 14 foot RIB boat (deflated for shipping) with an electric Yamaha HARMO outboard. It is sideways against the center of the backside of the living area. When the seastead is moving forward the dingy is shielded from the wind by the living area. On the lower part of each leg will be several bolt on heave plates. These will help dampen the response to waves. About 25% of the displacement will be for LiPo4 batteries which will be put low in the 3 legs. Each leg will have its own charge controller and inverter so there is triple redundant power on the seastead. Also, the thrusters for a leg will get power from that leg's inverter or batteries. So the 3 pairs of thrusters will have independent failure modes as far as power. When the seastead is going to be staying in one place for awhile, we can put down 3 helical mooring screws and give the seastead tension legs so it becomes nearly stationary when parked. Near each corner there will be a pair of helical mooring screws with a motor unit between them. We only plan to do this in the Caribbean where tides are very small and in protected places where the saves are small, so pulling down 3 feet will be sufficient to never go slack. Two seasteads will be able to connect together with a walkway, one behind the other, so that while underway people can move between seasteads, enabling a real community. The two computers for the two seastead will both work thrusters to minimize the movement of the walkway, particularly when warned that someone will be on it. In a harbor people can go between yachts or seasteads using dinghies. But some day we would like to be able to have seastead communities that are not by land. If we had the computers on two seasteads working together they could move along side each other while underway and we could do a "ship to ship transfer" (STST). We want this for cargo or people. In practice people will probably carry small cargo. The stabilizer fins still out beyond the edge each of the legs so you have to be a little careful in getting two seasteads close together. The first seastead will hold a steady course, maybe away from the waves, while the second seastead approaches from directly behind. The front leg of the following seastead is in very nearly the same wave as the back two of the leading seastead so they will sort of naturally go up and down together. We would only want to do this when waves were small enough that the two seasteads could each be very stable. But with small waterline area and active stabilizers this might be fine for most Caribbean days. These seasteads may only go up or down less than 2 feet. So we don't want any "active stabilization gangway" or expensive thing. We will will get the seastead stabilizers/thrusters/computers all working well before we market the system. Additional software does not increase per unit manufacturing costs, so we would like to do as much as we can with software. The existing computer will control the thrusters, stabilizers, and have a camera aiming forward. We will be doing this between seasteads that are of the same type so it will know that the back of the seastead is 40 feet wide and be able to judge distance just with software. Beyond software for the seastead computers, what sort of equipment would be needed to do a "ship to ship transfer"? How costly would this equipment be for each seastead? I guess really it can be an option and only some seasteads would have the equipment. How reliable would the procedure be? Do you think it is practical? A related idea is to connect one seastead to the back of another like a trailer to a truck. This might only be possible in a harbor and not under way, though I wonder if some method might be possible. If we got a winch line between and then have the seastead thrusters pull apart while the winch pulls them together there may be some way to connect even with some waves. If we connect while in a harbor we can also add some very stretchy rope one both sides boty from up high on the front (top fo corners of living area) to down low on back (bottom of legs on back) and also low on front to high on back. This will help stabilize the two seasteads so they move together, and with less motion than they would on their own. We may want both the solid harbor connection option and the walkway for when connecting while already underway. Having at least one seastead with the setup to do ship to ship transfer could make a seastead community possible. With this you shopping for food or spare parts, going to a doctor or having doctor come to you, visiting a friend for dinner, working with someone on a project, having a handyman fix your dishwasher, etc. all become possible. So STST ability is really the key enabler for seastead communities that are not by land. So this is important.