Have you ever thought of a solution to poverty being 'to build?' you hear in south africa of the state building r.d.p. houses, where the state pays for them, but, what if the local squatter got a few bricks and some cement, costing hardly anything, and built their own house? this would be fairly cheap, yes? but, if all the squatters can do is build it will make for a terribly strange environment with no jobs, so, they build a place of work too? With this 'place of work' and house being built, there might be a way to satisfy the needs of others. if they were to get a banker out there, they could pitch how they would all subsidize each other financially, as, if their camp or new homes area was saturated with a loan, they would see that money change hands between them, as one would sell cool drink and the other jackets, yes? this would lead to a balanced economy where the money may be banked with the bank they got the loan from slowly repaying it as they make money, of course.
I'm assuming these squatters you talk about are squatting now, through absolutely no self-imposed reasons? I mean seems to me, the required effort needed to accomplish the great task you lay out, could be seen as great employment potential.....
Maybe the best way to employ and house the people of the third world would be to observe that if they were to take the social grants into account, they could spend less by building small houses for many of the people? this would be reallocating welfare to make money, when they build places of work for the people? Imagine this; there are three men in the village, harry, fred and jack, and, they are all unemployed and not 'housed.' the state decides to build them small five thousand dollar houses, so they owe the state five thousand dollars. then, they all get a place to work, making bread. this requires about five thousand total for all of them, meaning they owe the state roughly twenty thousand dollars. seeing as how they may now do business, they can repay the state if they find customers, and, if they carry this model out for a wide range of goods, they will make a model, for rapid employment, but who will buy the goods? As fred, jack and harry make bread, they can sell bread to people that make curtains, and, people that make curtains could make money from selling the bread makers their goods. this would allow for a nucleated economic system between two products, but, what if the state was to expand on this and develop more 'nucleated places?' then, eventually, there will be a way to pay the state back, and, they will be making a living too, of course.
That's an economy..... An economy built artificially by the Government. It might be a way for 3rd. World countries to try to spark growth, but it's unlikely to become profitable. It's likely to end up looking much like the Soviet model. A bunch of State subsidized low-tech, low quality busy work, with fingers crossed against the need to make repairs, or upgrade.