Nice.
RM123E is the Toyota publication for the engine repair manual, but they are hard to come by. I've been looking and they are sometimes on eBay but pricey.
Take a look at my posts on this forum as I've written a lot about various online sources for all sorts of manuals. As a start, see: https://www.hiacesoutheast.com/hiace-manuals. This site has the best electrical manual I've ever come across, plus others that are great. There are also lots of posts from others with CD sets etc so take a look around.
If you want to add to the resources, would you be able to digitise your book?
Thanks