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would remove that with an oscillating saw (fein etc.) or a normal saw even and then plane it flat. The closer you get to flat the less planing but if your plane is sharp and you know what you're doing it would be pretty easy.
My only concern would be what happens under the existing cill, how well it is sealed to the original and can you create a neat waterproof join there.
this.
you can even get at most of it with a good chisel and a hammer as long as you mind the grain and take care to not let the grain bite and crack too deeply. finish with a plane.
bright
Airhead
I would remove that with an oscillating saw (fein etc.) or a normal saw even and then plane it flat. The closer you get to flat the less planing but if your plane is sharp and you know what you're doing it would be pretty easy.
My only concern would be what happens under the existing cill, how well it is sealed to the original and can you create a neat waterproof join there.