Well, as to finding a guitar player there are many on this forum, myself included. I am just creating movie music for the past year or so because I spent so much money on loops and samples, that it would be stupid of me not to use them and get my moneys worth. I do play guitar at home almost everyday for about an hour and have friends to play guitar with at times too. I just don't do any recording right now because of all the other things I do as well, like my art and photography. It is a busy life for me, plus I work construction with a friend from time to time. But, as to your piece, I can understand the ambient atmosphere your working with and that's cool. I wasn't suggesting a orchestral movie score but a few more ambient tricks up your sleeve for an added touch.
Peace and Blessings, John