Sounds cool ! I can see how you would mod the rears ... looks straight forward, and then drill the rotors to match.
What about the fronts ? Could you also use a ghia rotor and machine down the rotor part until you are left with a hub ? Redrill the hub to the correct bolt pattern and then mount the redrilled rotor ? The ghia 'Hub' would also have the correct bearings for the spindle !
Just a thought but please keep us updated !
Sandeep