As ideas go it is not so bad, but where would a homeless person get $100 to make such a shelter? In any case most of them would probably use the $100 to buy drugs. By the time you got a decent sleeping bag it would be more like $200.

I am pretty sure there are very few places that want tent cities made of plastic cardboard popping up anyway.

As a solution to the homeless problem it has very little going for it. No toilet or bathing facilities for one thing.

As a winter camping shelter it has some merit. especially for car campers.