I'd go with the shipping containers,using hydro,once you've lugged tons of dirt you'll understand why.Fuck LEDs,go a mixture of HIDs for another year,wait till technology improves.
Miriclegrow is chemical filth,the easiest n cheapest way is fish emulsion and some seaweed extract,for under $10 you'll make over 50 galls of ORGANIC fertilizer.FEED THE SOIL NOT THE PLANT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
bob,I'd use less castings as they can glug your mix,topdress with them later remembering to incorporate it into the top layer of soil,you won't get a skim on top this way.