I've found detailed information on the International Docking Standard, enough to start work on a detailed CAD of the mechanism.
(http://www.internationaldockingstandard.com/download/IDSS_IDD_Revision_E_TAGGED.pdf)
I haven't been able to find the same info for the two sides of the Common Berthing Mechanism. NASA has some 3d models, but I'd rather not rely on someone else's reading of a document.
Thanks