Hi CC,
Interesting tree you've got there, I'm afraid I'd hardly know where to start with it and not to change the subject, but I sure like the looks of the purplish flowering tree in the background... any chance it could be a bonsai chinese wisteria?
I'm new to the art of bonsai, but I'm guessing any plant that has wood of some sort can be turned into a bonsai...like my recently purchased wisteria and lilac perhaps...
Renee