I wish it was more unix-way-ish so I could write my own UI with just the features I need, my own back-end (I'd like a less-bloated library storage convention wi

I wish it was more unix-way-ish so I could write my own UI with just the features I need, my own back-end (I'd like a less-bloated library storage convention without directories for every book, without title transliteration, with support for multiple files of same format (e.g. .code.zip, audio.zip, .html.zip) for plain HTML files and embedded metadata) and ony use Calibre for tagging and conversion (with conversion customization, and I can also see no reason why conversion tools should not be a separate project). Calibre is by far the best yet still could be made a way better.