Or, better yet a campaign. It's a 2-1/2 hour movie!
What would I need?
Popcorn. Lots.
US Cavalry. If you're doing the Wild West, you already have it. Old Glory, Foundry, Knuckleduster, Dixon…
Hollywood or "real"?
Sioux Indians. I have at least 7 manufacturers. Try not to get any duplicates. Chiefs to be played by Jewish and Scottish actors.
Brigade Games, Old Glory, Warlord Games, Dixon, RAFM…
Wagon train to take the whisky to Denver. You already have covered wagons. Old Glory? And the Captain is a lawyer and a good Republican. Hey! It's 1867! Not current politics!
Temperance women in buckboard wagons. Here, I'm at a bit of a loss. Where can I get buckboards? And seated women to drive them?
And for Lee Remick in a bathtub… Eureka.
Miners from the usual suspects. Add Etsy to that list.
Ditto Irish.
You don't have a town yet? Old Glory for resin. For laser cut MDF I would go with Sarissa Precision, Thingsfromthebasement or some listed in my "Bank" thread. Some nice 3D printed buildings are on Etsy.
Did I leave out a faction?
Or, you could do a Serious movie like The Searchers.