Hearty Congratulations, CB.
I can imagine what it must be like. I've written a book (on birds), which has been on my hard-drive for over seven years (I keep updating it) and I've had real interest from one publisher. However, I'd like the interest to be greater, with no disrespect to the publisher in question. At the end of the day I may serialise it in a magazine. It all depends.
I'm absolutely delighted for you. Long may your success continue.