While surfing through pulp covers, and firmly entrenched in a current steampunk fetish (it can't really be called anything else!), a synapse overloaded and my brain jammed the two concepts together. I've already got half a dozen titles, and plenty of reference material for both genres. Hopefully, the next one won't keep me up 'til 4:45 in the morning!
EDIT: Updated the art to look more like an aged cover, with folds and damage, and also added additional text that might be found on a typical paperback.