I haven't tried DCC as a wild west setting, but I've run 5E as a modern and as a wild west campaign. I suppose that DCC would port over pretty much the same.
The key for setting creation (I think) is to start off with simplicity and develop complexity only as needed. For example, when I ran OD&D Star Wars
I came up with a simple list of weapons and aliens and kept the rest of the game as close to OD&D as possible. If I needed something specific, like Jedi "spells", I would create a list as needed or enlist my players to offer their suggestions.
So my version of a Saloon Crawl Classics
campaign would be regular DCC with some pistols and stage coaches.
_________________Marv / FinarvynDCC Minister of Propaganda
; Deputized 6/8/11
DCC RPG playtester 2011, C&C
since 2003, ADRP
Since 1993, OD&D
player since 1975
"The worthy GM never purposely kills players' PCs, He presents opportunities for the rash and unthinking players to do that all on their own."
-- Gary Gygax
"Don't ask me what you need to hit. Just roll the die and I will let you know!"
-- Dave Arneson