Correct, the diagram is majorly out of scale as i chucked it together on paint and then realised afterwards it was on the piss, and i couldn't be arsed to amend it

Dimensions are definately right though, i stripped a block down the scrap yard for the crank, and i also obviously had the EFI flywheel, and measured it all up after

Ive just measured up the alloy CPS holder as someone said a while ago that the holder itself is only actually 30mm in diameter.

On my verniers its 30.11mm, but the hole on the block had an ever so slight taper which made it hard, mark the block up as above and then find the center of the circle and drilla 30mm hole, but to be honest 0.9mm is going will barely make any difference at all, you'll probably find even after drilling a 30mm hole its slightly oversize.