Prefabricated easily moveable homes are already a thing. You can go on https://factorydirectmobilehomes.com/ https://factorydirectmobilehomes.com/ right now and

Prefabricated easily moveable homes are already a thing. You can go on https://factorydirectmobilehomes.com/ https://factorydirectmobilehomes.com/ right now and buy a home larger than a shipping container for less than $30k. Modular apartment buildings also exist and can be thrown together quickly and affordably. Not to be rude, but the problem is likely going to take a bit more to solve than throwing shipping containers at it..