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what happens under the existing cill,
Good point. Thanks.
What type of plane would be best?
Also is an oscillating saw the same as a multitool? I've always wanted a multitool and could possibly use this as the excuse. Annoyingly the bare Makita one is on sale at SF and I have Dewalt batteries. The Dewalt is x2 the price.
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.