Went ahead with the idea of using the flexi plywood as a mold for the bonnet.
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The plywood shaped up pretty well, screwed it to the bulk head first then across on to the bonnet making sure it followed the bulk head as close as possible.
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Once i was happy with the shape i covered it in brown packing tape before adding five layers of fiber glass, i deliberately made the repair sheet bigger than required to trim to size later.
I forgot to take a picture of the glass mat in place so no pictures of that.
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Once the repair sheet had dried it was trimmed to shape and laid it to position then marked around before cutting the incorrect piece out. I put some large headed screws along the bulk head edge where the bonnet rest's against to act as a position aid for the final height to align the bonnet edge with the bulk head edge.
Section removed ready for the new piece to be fastened into place.
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Repair section in place ready to be glassed in on the underside. Made sure all aligned up then removed the bonnet to glass over the underside.
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Ground out the top surface join to back fill with fiber filler then running one layer of fiber glass matting over the join.