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gillies
I've extended a hatch which was pretty much as you describe and the guys I got to fit my hatch in my new place did similar. They warned against using power tools for the cutting, said the vibrations can cause some cracking of the ceiling.
You can get away with a bit of neatening up with the beading if it isn't perfect.
Be warned, it's a messy job. Clear as much as you can from the room below and put dust sheets down if possible.