Interesting idea, Sid....only problem I would see is that you'd have a devil of a time overcoming water issues. One of the main reasons you don't see many residential basements in OKC is that the water table is so high they're impossible or very expensive to waterproof, so I'm making an educated guess the same issue might be at hand for this. Not saying it can't be done, but it sure seems to risk increasing the $$$.