CWOK... this is my 32 S&W conversion...
just a little bigger than yours...
as far as finishes... that's going to be tough... if you want the yellow color, & something durable... maybe find someone who can plate it with Titanium Nitride ( I think that is an option on Desert Eagles, & comes out looking like "gold" ) otherwise maybe nickel coating would be better, may make it look more period as well ???