Luckily the guy that sold me the gearbox still had these parts. Bagged them for a reasonable price too. Learned how to use the surface grinder at work and have reground the front disc. Will have a go at drilling it later this week.
Very nice, will be watching with interest. I'm looking into what to do with one of my parts bikes that had the back of the frame chopped off, so might be going down the cafe/bobber route with that one...