And if the structure is going to be permanent, then using sea water due to a temporary shortage of potable water is going to result in a permanently weak buildi

And if the structure is going to be permanent, then using sea water due to a temporary shortage of potable water is going to result in a permanently weak building. I understand that this is supposed to provide a solid shelter during quick relief, but it's going to be much harder/costlier to take down than a tent if it becomes unnecessary at any point in the future.