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Easy peezy.....
Step 1 make a jig out of 3/4 MDF that is exactly what you want size wise. Make the jig oversize length wise to be able to clamp to the door
Step 2 Cut out roughly using a good jigsaw to about 1/8 from the finished opening
Step 3 clamp jig to door and use a bearing over type 1/2 shank by X length flush cutting bit to clear the opening.
You may drill a small hole in the corner prior to routing in order to more easily square the inside corner.... Use a rasp/riffler to get a nice square inside otherwise moulding installed will be difficult to seat.
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