We are working on possible minimal viable product seastead designs.

This is a kind of spar buoy, but one designed to be able to move through the water.
So it will be sort of a fat wing shape instead of the usual round spar.
It is also designed so the main spar fits inside a 40 foot container so we can ship it.
The wing will go diagonally in the container, so it can be 10 feet chord and 5 feet thick
and the wing about 39 feet long.

In normal operation the bottom 70% of the spar will be under water.
Along the underwater part there will be 4 RIM-drive thrusters spaced out along each side near the thick part of the wing.
By using differential thrust we can turn the spar left and right.
Buy using more thrust higher or lower we can help reduce pitch.
Buy turning left and right with the waves, while much weight is down low, I think we can reduce the roll as well.

There will be 5 floors inside the spar for living space then above the spar will be an open platform with railing 20 feet by 20 feet
with solar above that extending out 30 feet by 30 feet, making sort of a shaded porch area for fishing or enjoying the view.
The bottom floor of the spar will have lots of batteries and other heavy stuff.  
The next floor up from the bottom will probably experience the lowest accelerations so can be for working or sleeping in heavy weather.

From the bottom of the float/spare a cable will connect to a ballast that is 100 feet below that point.
There will be Freely Rotating Fairings on the cable to reduce vibration and drag.

Please make a 3D WebGL scene using the above description of the float/wing-spar part halfway in water.