The use of horse manure... I actually was wondering about my source so when you talked about this, my ears perked! I know I can ask about antibiotics used on the horses but what about e coli in horses? And will composting the manure kill it? We usually get several loads and put it in a pile to cook for about 6 months. Before we get it, it has already been kept turned to keep the heat up too. It is usually offered every six months so it has been accumulating and being turned for a good while. Oh, and we mix in chicken manure with it too, from our farm.
And, that is exciting about the PT lumber because I keep thinking I cannot use it either!! Yay! Can't wait to see your raised bed plans!