I'd have to say I agree about most of what you said, particularly about the separation between something and nothing being an illusion. I think most opposites are an illusion, really; Take light and darkness, for example. These aren't two seperate substances -- the darkness is incidental, because there is light. Darkness is a product OF light. In a similar way, nothing (or what we percieve as nothing) is a product of something. Saying that light and darkness are a duality is like saying the side of a tree which you are looking at is an opposite entity from the side of the tree facing away from you which you can't see. It is one's own perception that creates these concepts of 'light' and 'darkness' in the mind, and likewise something and nothing are concepts.
Actually, the idea that something and nothing are a duality is somewhat absurd, because the concept of 'nothing' is absurd. There is no such thing as 'nothing'. If nothing did exist, it would then be something, and therefore is negated by sheer paradox. I think 'nothing' is just a concept that we use, and nothing more than that.