I have one small cabin at the retreat club I belong to but I am wanting to add another. I was thinking about doing all poured concrete as a means of construction to make it more or less "bomb proof". Thought about a 20X16 size main level on top of a 32X16 basement that walks out on one end and has a safe room built in on the other. Would have the roof of the safe room be the back porch as camo if you will. Any other ideas on how to build a fire proof house that allows for good defense?