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You are all correct. Even though nearly all rain in Melbourne comes from the south west it can give nasty surprises.
I intend to put a flat piece of flashing against the bottom roof top edge and seal it with silastic to form dams at the top of the valleys. The upper roof will have flashing that covers its top end and just clears the lower roof. This will ensure the drip line from the upper roof is well down the lower roof.
In image one the lower flashing would cover the visible timber. In image two you can see how well this would all mate.
Water can flow uphill with the wind behind it and get in where you least expect.
Bert
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