I know of only one guy in my area that collects, paints, and games with 54mm. He has collections for ACW, WW2, ancients, and I'm not sure what else. He used to present spectacular convention games. His Greeks and Persians looked fantastic, and so did his WW2 figures. Not sure what rules he used. His WW2 stuff was used for street fighting. I'm sure western gunfighting would be a good subject for 54mm.