I've spent a good chunk of the year making ebooks from out-of-print dead tree books. Proofing and formatting takes a ton of time. Nobody reads them but me.
You'll be that guy that records old shows on VHS and when he died the only record of old shows was donated to an archive/museum. A priceless contribution to humanity.
Mobile app called vFlat to do the scans and OCR. Cleanup in Google Docs. EPUB creation in Calibre. Then for proofing, I read the whole thing on an Onyx Boox, which lets me mark it up with a stylus. Then back to Calibre.