Thank you so much for the advice. I even have the boards. The biggest issue is just how little soil is left once the rocks have been removed. I am going to get massive amounts of compost and horse manure which I have found on Craigs list and let it stew for awhile. I will have to dig atleast 2 - 3 feet to get under the caliche to provide enough drainage. Going to see how we can do that with some kind of machine...maybe a hole digger or small bob cat.