The control panel is a thin aluminum sheet, estimated to be about 0.020" thick:

It's possible there are variations in thickness, as Zeta's and Gamma's in particular seem to look a little thinner - maybe 0.016" - but with current photos there's no way to be sure.

As to the surface brushing, in Delta it's subtlely left/right; in Zeta it runs up/down.  Alpha's and Beta's surface brush is more random, though with a bit more left/right than up/down.  Gamma's TMOST pic suggest up/down.  Epsilon's has been cleaned recently, so its original appearance is lost.

Where to get:
These sheets are available in some hardware or hobby stores or easily online at metal sites.

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