It's been sent in

It's sort of done.
I have done just about everything I can do to the book and am too close to it to see if anything else needs to be done.
The publisher asked for 'technical readers' to go over it to make possible suggestions for changes. This is a good idea as long as I get to pick the readers.
I wound up with one in the USA, one in Canada and one in England, so there's a nice sort of internationalism to it. There is also a little money in it for the reviewers.
When and if they recommend changes it is up to me whether or not I do them. The book will then go into production.
Still waiting to hear about a few odd illustrations but I can go ahead without them if they do not come through.