Below is what I feel is a great thread on the Pelican Engine Building Forum on how to take apart a late water-cooled Turbo engine.
Since this engine (along with GT3 and GT2 engine), as is clearly shown in the photos in the thread, is nothing but the old air-cooled crankcase with water jackets over the cylinders and 4 valve cylinder heads, I thought this might be interesting to some here, particularly if you have taken apart an air-cooled 911.
http://forums.pelicanparts.com/showthread.php?t=186287