Hi,
I saw this before. It is a severe job. You have to disassemble it, machine bits and pieces, intoduce a manual focus helix etc.
Just from the optical cell, the Sonnar 90/2.8 is the only lens with can be adopted to an SLR. For the other lenses, the back focal distance of the other lenses is to short for this (the rear element will not clear the swing mirror 😱). Actually I understand that the Sonnar 85/2.8 for the Contax SLR series (CYMM) is essentially the same lens, just tweaked to give a shorter focal length. If you want a short Sonnar to play with your SLR, it will be easier and cheaper to get a new-old or used sample of the Sonnar and use a CYMM-to-EOS adapter 😎.