The question I need to answer for myself, is how much steampunk is enough to be included, but not the emphasis of a given setting? I am working on an Old West Gothic Horror setting for Pathfinder, which would include some steampunk elements.
I am sure some availability of airships is necessary. I am already including steam trains (but those were real and not so much steampunk). I do have the idea of creating a full deck plan of a Mississippi Paddlewheel Riverboat - also thinking by attaching a diregible above it would allow the riverboat to travel up fast-moving, shallow waters so it could serve a much wider area out west, where rivers aren't necessarily that deep - at least not deep enough for a large riverboat's needed draft.
I'm really not a fan of steampunk, but in a gothic old west setting, some elements do belong.
Thoughts?
Back to the OP, I don't know how the game runs, but I created maps for FASA Games 1879 setting, which required me to create an airship map with 3 decks.
There's also the upcoming Stormbunny Studios Rhune setting which is viking steampunk - I did 6 maps for that setting as well, but I don't think its been released yet.