Good work mate
.
It'd probably be easier to take 0.5 from the bearing faces than from the outdrive inner faces,they're rock hard,though if you could have got them in a suitable lathe's chuck you'd have skimmed it off easily.
Not sure about skimming 0.5 from the outdrive bearing seats though,
they'd have probably fractured across the dogbone slots.
It'd be a mare to shim the slots out to support things whilst they were
being machined too.
Do you think you could get a couple of slipper plates turned up for me
at all?