Using bits from a CB500T I managed to get the installation done.The main thing was the speedo drive,but by modifying the original item without the chrome ring it worked perfectly.
The good thing was that with Vesrah rubbish pads in one side and Ferodo decent pads in the other,it was like early-ABS on a bike....the Ferodo side would brake ok in any weather,but the Vesrah side just wouldn't work at all in the wet.
The splitter under the headlamp was used ok,with a double banjo bolt in the place of a single for a single disc setup.
This was my summer commuter setup,but during the winter I had the original F1 forks with the fork gaiters and the single disc,together with a 4.10x19 Avon Roadrunner.
When I sold this F1 I put the twin disc setup on to the wifes CB550F2.