1/ as for book reader part, don't know, with decent audio engine, oscp has few features not found in any other book reader
2/ i didn't made it as a-v player, but it uses libav already, so half of the tools (decoders) is there, so no need to open in mplayer (though possible because oscp was using mplayer as a slave in the first iteration). it is possible to extend it to display video part. feature put in todo.
3/ and skinning is going fairly well. looks good, works good. might release it in a few hours