Wagonist, I have read through your conversion, seems simple enough, however I really need to keep the 315mm disc.
The reason is because I will be converting my engine to an ST205 and because because the power increase is more than 10% I will need a VASS certicficate. If I am able to retain the complete ST205 setup, there will be enough engineering justification to say that the brakes and the car remain ADR compliant.
I was thinking I could get 2 piece rotors manufactured with a reduced offset to get the disc further outboard and use an adapter bracket to mount the caliper.
Curious to know if anyone has done similar.
Dynomatt, is there any chance I could get some images of your setup? In particular the caliper mounting brackets.