whoa!! thanks a lot for your throughly reply. Obviously you know your stuff as you show me several ways to achieve basically the same.
Right outta the bat this:
Code:
\titleformat{\chapter}[block]{\centering\bfseries\large}{LIBER \thechapter}{0pt}{}{}
\titlespacing{\chapter}{0cm}{0cm}{\baselineskip}
has fixed the problem with wide top margins on each chapter title!!
I am still evaluating the lenghty post, I have to try and see what does get the results in the cleanest way, specially the caput/chapter part.
again thanks a lot!
ps.: oh, now that you mention you are the same over LaTeX forums :-D
ps2.: so far looking good on my NOOK this pdf, except for the font problem.