I bet that when you remove the evap, you will find pinholes underneath. I would remove the whole liner and old insulation. Treat any visible rust issues on the inside and new insulation. I didn't go that far with mine, but wish I had.
Diluted CLR works well for cleaning up the calcium buid-up. POR15 will self level into the pinholes - I used POR for my bottom pan and left the rest original.
I'd leave the chrome the way it is.
An unobtrusive cleaning of the coin mech can be done.
New fans, T-stat and a good cleaning of the compressor area are always needed.
IMO - The best refurbishment is one that is not readily visible.