Hmm, Dwarf sag is a little thinner than I'd like in those pictures. And that link had some great info, but I can already guarantee I will be guilty of too many plant species, at least at first. Will probably plant a lot to see what works and then thin the heard and re-arrange when I see what is doing well and how everything is growing.
LGD: That would be great! Looked up pictures of both of those things and I like them! The Cobomba would be a great sub for the ambulia it looks like.