Just a quick follow-up: I did a scoping exercise with Part 1, Book 1 (the introductory chapters about Bishop Bienvenu/M. Myriel.) About 4 hours of authoring time, mostly in scanning and photoshop, and the result is 8Mb of lrf! At this rate, Part 1 (with 8 books) will be 60+Mb, and the entire book will be ~300Mb. The raw jpgs (high-quality, and mostly at 580 wide) account for almost 7Mb of that, so I suppose I could go to lower quality and compress the lrf by 3-4x.
However, the authoring time scales to about 160 hours, or, as I thought, easily a month of full-time work. A labor of love for my retirement, I guess!