The holes haven't been drilled yet Simon, so I'm ok there. I have to work out how much tolerance to give the insert holes. I saw that Wilkinson one you mentioned. As you said, I can't work out how they can get that 10mm adjustment when the pivot holes are set in the trem.

I'm still thinking the 6 screw trem might be better. Just have to clamp in the neck and see how high the saddles need to be.