1 x BID & peel ply. Using the 50" Colan BID I could line up the leading edge at 45 degrees, and still do the whole thing in one piece.
As recommended in step 2 I had got some nylon 'sheers' for this step. I have tried them out on some small parts over the last few weeks with no issues. This is the first big test! [Timewarp day after tomorrow: disaster!]