Need Advice from Classical Guitarists

Despite what my friends might tell you, I am NOT the worst classical guitarist in the world. But I am probably among the top ten. So I would like the opinion of someone who, unlike me, can really play the instrument.

Before I take this new piece too far in this direction, can you tell me if what I've written is even playable?

http://www2.potsdam.edu/simonega/Library/Guitar_temp.pdf

I'm particularly concerned with measures 14 and beyond. I realize that playing the lower part at mp and the upper at ff is not realistic--I just told Sibelius that for the audio export--but, assuming the notes are playable at that tempo, is it possible to make the melody stand out like, or close to, the way it is in the recording?

http://www2.potsdam.edu/simonega/Library/Guitar_temp.mp3

Thanks for your feedback. I really appreciate it. I'm kind of in--no, not kind of--I'm definitely in over my head here.