yes you got that bang on adam, that 7 or 8 mil removed from the rear rings a bell,it was so long ago and i didnt think to write down what was done as i didnt expect anyone to be as daft as to follow me! :D
5mm clearance between back of fly and block,and an overall fly thickness of 30mm with the clutch face protruding 0.5 should be perfect.If in any doubt at all just copy the dimensions of your turbo fly if its at hand.
Looking back at the amount of work to get these 3vze flys to fit its much easier to find a 1mz manual one in the states.