There are a lot of alternative steel home products, but it takes some design skill to keep them from looking stupid (see some bad examples here):
http://www.steelmasterusa.com/quonset-hut-homes Google “metal building homes” and you’ll find several other terrible examples.
I have designed (but never built) some pretty funky “Quonset” homes… I’m convinced that you can build a very Dwellish abode with steel buildings, but the creativity-killing regulations will most likely prevent them from happening in
SoSA (whole nuther subject).
Steel buildings can be inexpensive, hurricane resistant, green, and architecturally acceptable at the same time… problem is, it’ll probably be a wash after you pay the right designer to keep it from looking like an abortion.
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