It's the curved bit at the top of the wall that concerns me for cutting the panels and also the installation on the edge strip due to the curve. Any ideas?
Presume you are talking about wet wall? As suggested - make a template even out of thick cardboard and make some exacting measurements then transfer it to the board.
The edging is different, all depends on what type of edging it is.
If it's a 2.4m board and made of a similar construction to hollow soffit I'd cut the rear of the board at the bend and it should have enough flex in just the front finished face to follow the curve of the ceiling allowing you to do it all with 1 board.
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