If your going hard like that you might have the warbucks for peter lawtons system, it's mainly the flood trays that save on water and manage the plants that set's them apart. The elite roots system produced by 3d pots are bar none the best way to go into nursery production for yourself or in surplus sales, I'm look at this for myself. I can't imagine being able to produce competitively and buying in another growers tree's you don't know, I dont even see it as frugal but simply critical. Check out this video of the scale he's working on in his home setup, 10 racks to me is a serious small scale system. Being able to grow tree's on to the advanced stage without root retardation is just another level of certainty you can operate on that others can't.
http://www.youtube.com/watch?v=0c7FyujVNP8
give me a critique of his system, I havn't been able to find much nasay to really put my idea of this systems viability to the test.