You might also be interested in designs by Paul Elkins. I like his use of coroplast
While his work is inspirational it is really not moving the needle on solving this problem. He is a tinkerer, wish he would put his idea's into motion to produce his designs like the dude making the wheelchairs in Utah.
These people are your neighbors, your neighborhood is home to them, they just don't have houses.
I think the best term that has the most impact is Sleeping Rough Outdoors. You read that and it does not matter what side you are one, you now how the person is living and it describes the plight that many homeless face when just needing to get some rest.
The concept you are describing is a "homebum" which describes a person who sticks to one area. This is different than a "hobo" who keeps moving and is not as much a nuisance of homeless. A "rubber tramp" is a homeless person who lives in a vehicle.