I've finally finished the book project. All in all, I'd say it took about 40 hours to get these six books edited and published. These new books are pretty substantial and have 450-600 pages each.
If you're ever looking to publish any type of book, I have nothing but the highest praise for lulu.com. I don't know how they can provide a service like this for such a low price. These six books cost just under $150 and when you think about how difficult one-off custom printing like this is, that seems like a steal. The whole website and process of creating the books was smooth and ridiculously simple.
Hopefully they stick around for a while so that I can continue to publish books for the coming years.