I've always thought that the sorts of storage sheds shown below (for US homes, manufactured by Rubbermaid and others) have the potential to be repurposed as sturdy dwelling units for people.


Solar panels integrated into the roofs of structures like the above would help offset some electricity costs.. Low cost devices like the ones below (again, sold in home and garden centers in the US and elsewhere) can be scaled up to create free-standing lamp poles to line streets.

Thankfully now there are designs like the Abod that are moving us towards the dream of "solving" homelessness.
Also, this is a step in the right direction.