I live in a rural area where the population is declining rapidly. There's plenty of land available for cheap, but actually building a house still very expensive

I live in a rural area where the population is declining rapidly. There's plenty of land available for cheap, but actually building a house still very expensive. I think a cheaply built, single story structure on a large tract of land could work very well here, and could possibly help to sustain the local population and quality of life. I agree we should be building denser to meet demand for housing in cities. But not everyone needs to live in a city.