I wanted the front bezel to look like metal. So I used a technique I saw somewhere on the RPF: Zinc Galvanizing Spray. 

This is a paint with lots of zinc metal in the paint. It goes on grey, but then can be shined up using steel wool.
However, after polishing the whole face, it did look like metal, but also very boring and monotone.

I had purchased some cream colored paint to try as an alternative, but then had an idea: Use both!
I sprayed a very light coat of the cream colored paint over the zinc. I then polished away the paint. It really looks very nice in person. The zinc shows up as glints of metal, and the paint makes it look like the radio has been around for a hundred years. The coolest part is any more wear over time will just make it look more authentic. Later I added some washes to break up the two color finish with a bit of very light rust.

I SLA 3D printed the logo, and small buttons. Then used a molotow chrome pen to make them silver, aging them similarly.

I did another test assembly of the radio, and it looks (and sounds) like it was taken right out of the game.

There are still a few more things to do. The gauge is currently paper, and it needs to be replaced with laser etched brass.
I have some fake vacuum tubes to add to the interior, along with LEDs to illuminate them.
Then everything gets wired to the rear panel, which has authentic rust on the steel plate.

I have a few electronic bugs to work out. The major one being that the Pi Pico doesn't want to show up on the Raspberry Pi at a fresh boot. I have to physically remove the Pico from the PCB, reset it, and then plug it back into the board with USB still attached.