Hi again. I was just thinking about it. I do have some experience writing GDD's. I could help out some with your work. I do not have a clue how much to charge on that sort of project, though.
Experienced game designer. I can develop a detailed GDD (between 10 and 20 pages) for you in less than a week (no formatting, you can apply your own) an we can have a brief 1 or 2 hours meeting so that you can explain to me what your game is about and what your needs are.