Your compost portion is crucial for growing organically, so make sure it is high quality, that is number one in my book. In my grows now days I prefer mostly botanical inputs over things like guano, or feather meal or even cotton seed meal. Cotton is not regulated as food, so it can have loads of pesticides and other nasties, just so you know. The greensand takes ages to break down, so i would only use it if you plan to recycle your soil mix. The rest looks Ok to me, but you might want to strive for diversity in your input mix like you have with your rock dust collection....scrappy
