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 covering that and on foldable panels going out 8 feet from each side.
We can either fold down some solar panels to block wind or use clear roll-up/down vinyl curtains.
So there is a shaded porch area for living, eating, working, fishing or just enjoying the view.
If the wind is too strong though we would have to roll those up the currains and even fold under the solar panels making
the still active solar only 20 by 20 feet and very little wind resistance.  
The bottom floor of the spar (lets call it floor 1) 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.

On the outside of the float/spar from a bit below waterline up to a hatch in the porch area will be a built in ladder.
There will be no through-hulls in the float/spar.  Only way inside will be another ladder from the porch that
goes down inside the spar.

Below the float/spar will be a cable going down to a ballast.
It might be good to have a winch to raise and lower this ballast.  
But it also might be nice to have a fixed cable and Freely Rotating Fairings to reduce vibration and drag. 
I think the longer the cable the more steady the spar really is.
What do you think?

Please estimate the displacement.

If the cables, spar and the porch are made of duplex stainless steel
The spar will be one piece.  The porch will be many pieces that are assembled on location.
Please estimate  the weight of the structure parts and total. 

Please estimate the total amount of solar.
Estimate if we are in the Caribbean the average kwh per day.
If we had batteries for 4 days of power, how many lbs would that be?
Assume the batteries, inverters, and other heavy things are on the bottom floor in the spare.
If we used that kwh/day evenly over 24 hours how many average available watts is that?

How much can should the ballast be?

If we have 8 RIM-drive thrusters that are efficient at our cruising speed, and used 60% of our "average available watts" 
for thrusters, how fast do you think this wing shaped spar buoy could move in MPH?

How effective do you think using thrust on higher and lower thrusters will be at reducing pitch in normal Caribbean waves?
How effective will turning to combat roll be in reducing roll?
How comfortable do you think it will be on the various levels in the spar and in the porch area in 3, 5, and 8 foot Caribbean waves?
Try to estimate G force at each level (assume we are trying to use thrusters to reduce roll and pitch).

Please estimate the total fabrication cost in China.  Assume basic interior stuff, not luxury.

Do you think this might work as an minimal viable seastead product?  Anything you think you would change?