Took me a while picking away at it an hour a time. But it’s done and I’m happy with it. Maintains temps exceptionally well. I bought the fridge for $10 in the local classifieds. It was sitting in the bush for years lol.
I love the tasteful attention to masking and preserving the original style elements of the door handle, etc. The dark paint is pleasing indeed as a contrast to the shiny ducting.
Maybe stating the obvious, but you'll need an air intake in the mailbox, preferable the bottom since you're drawing smoke out the top center. If you're using a couple Amazen sort of labyrinth trays for smoke generation, I'd suggest a 2x6 array of ~.75" holes on a 2.5" grid. The part of the labyrinth needing air at the time will then preferentially suck through the nearest hole.
And you'll want to ensure your smoke trays don't touch the bottom or side of the mailbox or else your paint may blister.