I thought I'd posted it somewhere, but nonetheless:
BB Markgraf, Prinzregent Luitpold, Helgoland
PD Hannover, Schliesen, Schleswig-Holstein
CL Niobe, Nymphe, Thetis, Amazone, Medusa, Arcona, Hamburg, Berlin
DD: 24, various types but mostly new-ish
The idea of adding German ships might be a problem for a few reasons.
First, I'm skeptical that Germany would give more ships to Turkey when Turkey had trouble operating Goeben and Breslau. Unless you tinker with Turkish history, they're lacking the ability to maintain a modern navy of note.
Second, Germany might be loath to give up another BC if her historical opponents were supplemented by Nordmark and Atlantis for starters.
Finally, I believe the Allies seized Goeben historically; if things have gotten nastier for the Turks, to the point that chunks of their territory have been turned into mandates, I can't see them giving her back, let alone tolerating a larger fleet than historical.
J