Nota: The installation problems above this post were resolved using the
static package instead of the
dynamic one.
Conclusion: Wonderful software!!!
I can now have a PDF with embedded fonts, dropcaps, full cover page and a justified text. The total weight of the file went up from 490 k to 920 k which is quite OK.
No work to do. As far as your original EPUB uses styles, no problem.
Thank you very much!!

Congratulations to Jellby and Prince.
I join this six inches (9x12) PDF as a proof. The original EPUB has been published on MR some days ago.
@Jellby
EDIT: I tried to produce a 9.7inch PDF (that is 14.8cm 19.7cm) and I did produce a frame of this size but the image and text were not increased beyond 9x12. I surely did something wrong, can you produce one for me as a demo (and explain)?
The original EPUB is
here.