Sorry, I accidentally sent the message before I was done blathering!

I need to make some 4-11/16 inch holes in an aluminum instrument panel. The
panel is 1/8 inch thick. In the past we have used a simple hole saw in a mill,
but those holes were 4-1/4 in diameter, so I was able to find a standard hole
saw size. So far, I have been unable to find a hole saw in the size I need.
We also punch and drill some smaller holes for a fuse (1/2 inch) and for an
8-32 tapped hole.

Can anyone suggest a good way of producing the 4-11/16 diameter holes? We have
your basic drill presses, lathes, and a manual mill available to use.

The material I have is 6061-T6. I'm using that because that is what Digi-Key
sells, to be honest. If there is a better material (must be non-ferrous), I
would appreciate a recommendation as well as a source for 20 or so at 7 x 19
inches. We are in northeast Ohio, USA.

Thanks.