Nice idea, but unless you're well off you'd still need a loan and I think you'd struggle to get a secured loan / mortgage on that. There are of course permanent caravans which are effectively a similar thing that have existed for many years, some can be even cheaper.
Not to mention a non-standard in$urance market that would have to accompany the mortgage. Getting it built is one hurdle. Dealing with the legal bureaucracy is another.
And if such construction ever caught on in great numbers you'd have the home construction lobby all over it on Capitol Hill trying to make them illegal.
No question there's some real obstacles in seriously pursuing it. But I still find them physically fascinating. With affordability over size. A compromise I suspect a lot of people would be willing to entertain.
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