Put some 28x4 pieces of Coosa (ribs) with the edges beveled at 25-30 degrees (yeah - the shallow angle that is hard to cut with a circle saw) on the bottom of the 36 inch coosa panel after you put 2 layers of 1700 on it then put 2-3 more layers of 1700 over the ribs. make sure all the layers of 1700 go completely to the edge and tie together. It is a good idea to put a layer of glass wrapped around the edges of the 36 inch panel first or to wrap the top layers around so you don't end up with the edges in shear with no structure.
