I wanted to see how you have got on so far?
I'm in a similar fix trying to track down the birth records of my Grandfather who was born in Constantinople, to Jewish parents but I don't know how to look for such records. Its a desperate shame that no compilation of data such as in the UK and USA has been done as yet in Turkey.
My own Grandparent was born there in 1912 but I am clueless as to where to begin. Have you had any further development?