[CaptainHaplo]

I want a concrete dome.

I would prefer to earth berm it - as that not only adds additional protection from crazy nature stuff (except an earthquake). Besides, how cool would it be to say "ok, I am headed out to mow the house." Easily hidden if you wanted, just a thick mess of trees out "front" and no one would see you.

Add in that made right, your looking at a system that naturally convects and stabilizes air temps at right around 70 degrees F.

In an ideal world I would just buy up one of the old surplus missile bases the gub'ment or private sellers have. But I don't see that happening.