Sounds like something I might be able to do. Do you have a picture? I'm wondering what kinds of plants the soil depth allows.
Edit: Okay, I found this website. One bag per tomato plant. I might have to do this!
http://www.motherearthnews.com/Organ...rden-Beds.aspx
I tried a straw bale garden one year. That's considerably more work. The bags sound more do-able.
Oh! And here's a photo:
http://www.vegetablegardener.com/ite...or-no-dig-beds