We are working on a seastead design that will have a 40 by 16 foot living area above the water.
There will be 4 foot wide columns that are about 24 feet long going out from 
from the 4 corners of living area and down into the water at 45 degrees, which half of
each column under water.   
There will be 2 cables going to the adjacent corners to hold it in place.
There will also be a cable making a rectangle between the bottoms of all the floats so we have some
redundancy in case one cable breaks.
The seastead is about 36,000 lbs I think.


Please used Froude scaling rules to give me the dimensions of a 1/6 scale model
for the living area and the columns in inches.
Also give me the total target weight of the scale  model in lbs.

Near the top of each of the cables in the scale model I will have a section of rubber surgical tubing.
The amount this stretches will give us some idea of the tension on the cables.  What sort of 
tension range is surgical tubing good for?  What would that range correspond to in the full scale model?
Does that seem like a reasonable range?
Can you find low cost waterproof digital scales designed for going in series with a rope to measure and log the tension on the
rope that are for sale on Amazon that we might use instead of the rubber tubing?
I searched for "rope tension data logger" but did not find anything using that search.

We will test this in Sandy Hill Bay, Anguilla.  
We will either tie it to a mooring or have a human hold a line to keep it from moving, maybe using stretchy line to be
sure it only has a gentle force from this.
By where in the bay we position the model we can test under different wave heights.
To simulate 3 foot, 5 foot, and 8 foot waves what scale height in inches should we try to find?

Are there apps for an Android phone that we could use to record velocity/acceleration/jerk  
and pitch/roll/heave of the scale model?  Which would you recommend for monitoring our scale model in waves?

Actually it would be nice to have an Android app that could record video to give an FPV view from the seastead
using the camera on my phone and also put acceleration data onto the same video as it recorded it.  
Can "Phyphox" can do this?   Or is there another app?  Or would I have to record video and acceleration data
separately and then combine them with some other software?

What sort of accelerations in a 1/6th scale model will correspond with plates starting to slide around on a table 
in a full scale version?  What other metrics of acceleration could we use to get an idea from the numbers on
the model what the full scale would be like?

I am thinking of putting a glass with a few rocks and filled with water so video can record how much the water tips
around in the cup.

We will have a long wooden pole with marks on it that is either pounded into the sand or tied to a weight on the bottom
to measure wave heights.

We will have a main camera will be mounted on a tri-pod on shore (fixed ground) and with a zoom lens so it has good detail of experiment.
This camera will shoot at a higher frame rate so we can slow down the video based on Froude scaling of time.
This will let us analyze how much the model heaves or tips using part of the model to get the scale.
We have done this with past models and been very happy with the results.

A second camera, maybe a go-pro, may be on the model to give a sort of "first person view" from the seastead which might
let a viewer really feel how much the tipping would be (video also slowed by Fraude scaling).

Are there other ways of measuring the results of the scale model that we should consider?