A bit late on the timeing but I've seen it done and taken it on myself. Flatwork contractors work f'ing hard and its not easy to get it right.

I did a 25x40 apron in front of my shop a couple of years ago. I had about $3100 into it when I was done, my labor, preferential pricing on the 18 yards of concrete. This included rental of bobcat, plate compactor and backfill materials and rebar etc. I took it down 2-3 feet and backfilled w/ sound fill. It took me several weekends through the fall, then one day w/ me plus 6 guys to place the concrete. It came out OK, it heaves in one corner and has a couple of low spots that puddle.

It kicks ass for things though. Basket ball, roller blades, working on cars outside, keeping dirt out of the shop.