Do you have a specific style or model you want to replicate. Also full size or smaller scale? I think it would be a fun project but the glass tops and dials could still add up. Maybe a place to start is a business that sells/services petroleum pumps. Often they have a boneyard out back and you could score an older mechanical pump and make it look vintage with sheet metal. At least you would be starting with a base, dials, hoses and nozzles. Just a thought.