Resurrecting an older thread because I just found this but I don't think too many will mind. Further updates out there some where?
As to Chinese architecture of the old west, I'd say it is mostly the same as other buildings and only the use and signage made it different. Coloma has a few preserved Chinese buildings and that is all that makes them different. Oh, for those who don't know, Coloma was the site of the gold discovery in California (January 1848) that set off the Forty-niners and, in a very real sense, started the "Old West". Before that, it was pretty much Texas and the Mexican-AMerican War and, at least to my mind, that wasn't the Old West.
I, too, am working, slowly, on my own scratch built old west town but in 15 mm.
I'm off to google Coloma and see if they have photos of those Chinese shops - apothecaries, joss houses, bath houses, and the very familiar laundry being fairly common. (Sorry, very few images - but they just show the signage as mentioned - and some colorfully painted door and window coverings but otherwise standard architecture.)