I find it hard to believe that Chipchap was the only one that posted a comment that had a tiny piece of a clue. You obviously said you have a house, and I'm assuming a slab foundation. No chance of colapse there. You could have filled it with sand and had no problem. I guess people just don't want to believe someone that wasn't them did something so outrageous, and yet at the same time, so ingenious. Good for you for entertaining me for 5 minutes as you intended to do with this blog. By the way, GREAT decision making flow chart!! We all think it, but you put it in writing. Let us know your next half-brained project, and good luck with the penguin search.