Agree with Wotto. Either full on or leave it.

First thing i'd do is change those red flippers for the correct white with yellow rubber.

I find it interesting that with classic/vintage guitars, as soon as you refinish them the value drops dramatically. Scratches and dings are considered "Mojo"

With pinball it seems losing the Mojo for a nice new scratch and ding free cabinet is encouraged and in a lot of cases adds value.