Re: Cutting irregular hole in panel
The standard way is called 'stitch drilling'. Mark the hole you want to cut, perhaps on masking tape applied to the panel. Drill a sequence of small holes around, and just inside, the edge you've marked. Join a few of them together with the tip of a needle file, then continue this if necessary with a junior hacksaw blade. Wiggle the waste piece of metal out. Tidy up by hand-filing.
Cheers,
GJ
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