Steampunk Worldbuilding Questions

I'm in the early stages of creating a world in which a steampunk Western can take place. Here are some of the questions I'm asking myself. Some of them I answered promptly; some of them I'm still pondering.1. Alternate history or alternate world fantasy? How close will my world be to the "real" world? Is geography the same as in the real world?2. Overall mood: is it utopic, dystopic, or