Great job -this is a very well considered detail and I wish I had seen it a couple of years ago when I was building my MBC house. I did ask around at the time and received various ideas. In  the end I developed my own approach as follows:   I installed an 300mm alumium flashing, it was actually the black powder coated aluminium roll used for seamless gutters but rolled as straight pieces with a seam rolled seam for strength. It seems to have worked out well - it is screwed and stuck to
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