As far as approaches to programming, I do believe it is a valid approach to create a detailed specification first and then produce the code to meet it. That is how I would do it, that is how many programmers do it. The spec can be just a description in plain English, as I often describe in my notes in plain English what I the app to do and then research as necessary on how to code it as I go along.

In this case it appears Ohad has completed most of the research so I'm not sure what is holding things back. This is why you must ask him questions like where the code is.