This Will give me something to do tomorrow afternoon.
Very nice map humbletree, thank you for taking the time doing it
about the opacity try with 2 version of each layer , put them again in your order from 1-8 and again in the same order 1-8
first time put each layer 85-90 opacity and second 40-50 , it gives a nice view of the areas where 2 or more layers overlap
maps by idalain