Tom, Come on, 12 feet squared by 4 inches thick would only be 96 80 pound bags of cement. Child's play.
How about if you pour a few footers, then just build a deck on top of the footers. How much head room do you have? The footers don't need to be more than an inch or two above the dirt. but the joists would add depth. At 12 by 12, I think you could get away with four footers pretty easily. -- Blue skies. Dan Rossi Carnegie Mellon University. E-Mail: d...@andrew.cmu.edu Tel: (412) 268-9081