Desperado - Any photos of your handiwork post tornado? Or even pre? I have every confidence that structures can be built to withstand most if not all tornadoes, above ground, I just think it'd be neat to see if afterwards.

I would think that poured reinforced concrete buildings would tolerate direct hits from at least some smaller tornadoes reasonably well, though certainly a roof and glass not designed for such things wouldn't make it which would make survivability of the event a lot tougher.