I read the thread BF listed and have to pretty much agree with what Huntingman said. I couldn't imagine trying to break new ground around here with less that a 20 horse tractor.
If you find something that works I would like to see it. We fashion a drag similar to what you are talking about but we just use it to cover the seed.
We plant probably about 15 acres in about that many plots from small to about 3 acres. It takes four of us with two tractors all weekend to turn, disc, seed and cover them.