Did a little custom machining today. Modified a set of OEM XS650 Trees and Steering Stem to accept the CBR600RR Upper and Lower Fork Clamps. Complete with Tapered Bearings, this will bolt up and fit like OEM, with no need for shims, adapters, etc..
You'll have to forgive the ugly headtube, I use it for such things as this.
The customer supplied a set of used CBR600RR trees, which I modified using an old XS650 Steering Stem, All Balls Tapered Bearings, and a bit of patience.
I'll leave the prettying up of the paint and such to them, but this should be a sweet swap for an old machine.