Jerry,
I intend to use my MPCNC for making aircraft panels too. In your case I would consider initially using hold-down clamps along the sides to allow you to drill and clear the corner panel mounting holes. Then use these holes to hold the part down for the rest of the work: drilling the rest of the holes, meter pockets and final edge routing. Last you could do the “etching” of the lettering being fairly confident that the lettering would be in the right place (because you’re using the same mounting holes for all machining).
One of the more challenging aspects of any kind of milling is choosing the best order of operations, especially when you may have to remove the part for steps that are not done on the mill.
Even if you want to use the “tap and glue” method to keep the parts very flat to the surface, I would still set up the holes for accurate registration for the following steps.
That’s my plan (when I actually get mine built). Here the link to my glider panel Gliders, Instrument Panels, Flying
This one was done that way, but on a friend’s machine.
Mike