One thing to consider is that the frame on the Kirkham is an exact copy of the original, so even if you changed your mind down the road the original style suspention parts will bolt right in.
The Girling brakes would be fine until you really have to use them, then the solid rotors will start fading on you. How fast you can get to 100mph is important but how fast you get back to zero can be a matter of life and death.
As far as originality goes, without a CSX # you'll never be "one of the boys" like the fiberglass CSX owners.
If it helps you can't see any of this stuff anyway, when you do pop a wheel off it's much more impressive looking than the original setup.
