will you be using clones? I feel this could easily be done with a healthy mother. I'm actually planning on doing a perpetual harvest in a similar fashion, but if you're using 5 gal buckets, any problems that come up in the root system of one plant in a bucket could potentially harm the other plants. (fungus gnats etc.)
what were you planning on doing with the 5 gal buckets as far as hydro goes? just plain and simple dwc? if so maybe going the soil-less mix would be easier to manage with a perpetual harvest every two weeks. that'll be a lot of buckets that will need a lot of water on a continuous basis and a lot of upkeep with ph and whatnot throughout the stages of life if you're going to put an aero pump in each bucket spraying the roots. the roots form into a big mass in the bucket as well, which you might want to keep in mind with anything you put in as far as pumps, since the roots will grow around and into these pumps, which can be annoying and troublesome if thats your only means of aerating the water.
take it easy and good luck