I'm still stuck on location as an issue. I believe most countries are claiming a 200 mile economic exclusion zone. That eats up most of the viable shallow water locations.
Also, even if you could put one just outside the 3 mile limit, I'm betting most countries are going to make the ferry service a real hassle with customs
and immigration controls.
If you go open ocean, getting food
, supplies and repair materials is going to be hugely expensive and again, many countries may make it really hard. The sea is a harsh environment
. If the suggestion is to replace rigging
every 10yrs, how long do you think this floating island will last without major rehab work.
Without some form of economy, it will never even be considered. Running a server farm sounds great until they won't let you connect the cables
to the nearest land without fees
so high, it would be cheaper to build it on the land you are trying to get to.
Totally irrelevant to the overpopulation question. The people running out of space to live are typically the poor. The rich or even middle class have no problem finding a place to live. So now you have a wildly expensive system for the poor...unless it's population control via planned sinking, it's a no go.
If you take out the need to escape some evil country, placing something in a protected lake or bay is a viable option. Of course we have those already...they are called house boats.